diff --git a/app/frontend/src/javascript/components/cart/abstract-item.tsx b/app/frontend/src/javascript/components/cart/abstract-item.tsx
index ede6f95df..611575b1c 100644
--- a/app/frontend/src/javascript/components/cart/abstract-item.tsx
+++ b/app/frontend/src/javascript/components/cart/abstract-item.tsx
@@ -4,16 +4,21 @@ import FormatLib from '../../lib/format';
 import OrderLib from '../../lib/order';
 import { FabButton } from '../base/fab-button';
 import Switch from 'react-switch';
-import type { OrderItem } from '../../models/order';
+import type { ItemError, OrderItem } from '../../models/order';
 import { useTranslation } from 'react-i18next';
 import { ReactNode } from 'react';
+import { Order } from '../../models/order';
+import CartAPI from '../../api/cart';
 
 interface AbstractItemProps {
   item: OrderItem,
-  hasError: boolean,
+  errors: Array<ItemError>,
+  cart: Order,
+  setCart: (cart: Order) => void,
+  reloadCart: () => Promise<void>,
+  onError: (message: string) => void,
   className?: string,
-  removeItemFromCart: (item: OrderItem) => void,
-  toggleItemOffer: (item: OrderItem, checked: boolean) => void,
+  offerItemLabel?: string,
   privilegedOperator: boolean,
   actions?: ReactNode
 }
@@ -21,7 +26,7 @@ interface AbstractItemProps {
 /**
  * This component shares the common code for items in the cart (product, cart-item, etc)
  */
-export const AbstractItem: React.FC<AbstractItemProps> = ({ item, hasError, className, removeItemFromCart, toggleItemOffer, privilegedOperator, actions, children }) => {
+export const AbstractItem: React.FC<AbstractItemProps> = ({ item, errors, cart, setCart, reloadCart, onError, className, offerItemLabel, privilegedOperator, actions, children }) => {
   const { t } = useTranslation('public');
 
   /**
@@ -32,7 +37,13 @@ export const AbstractItem: React.FC<AbstractItemProps> = ({ item, hasError, clas
       e.preventDefault();
       e.stopPropagation();
 
-      removeItemFromCart(item);
+      if (errors.length === 1 && errors[0].error === 'not_found') {
+        reloadCart().catch(onError);
+      } else {
+        CartAPI.removeItem(cart, item.orderable_id, item.orderable_type).then(data => {
+          setCart(data);
+        }).catch(onError);
+      }
     };
   };
 
@@ -40,11 +51,21 @@ export const AbstractItem: React.FC<AbstractItemProps> = ({ item, hasError, clas
    * Return the callback triggered when the privileged user enable/disable the offered attribute for the given item
    */
   const handleToggleOffer = (item: OrderItem) => {
-    return (checked: boolean) => toggleItemOffer(item, checked);
+    return (checked: boolean) => {
+      CartAPI.setOffer(cart, item.orderable_id, item.orderable_type, checked).then(data => {
+        setCart(data);
+      }).catch(e => {
+        if (e.match(/code 403/)) {
+          onError(t('app.public.abstract_item.errors.unauthorized_offering_product'));
+        } else {
+          onError(e);
+        }
+      });
+    };
   };
 
   return (
-    <article className={`item ${className || ''} ${hasError ? 'error' : ''}`}>
+    <article className={`item ${className || ''} ${errors.length > 0 ? 'error' : ''}`}>
       <div className='picture'>
         <img alt='' src={item.orderable_main_image_url || noImage} />
       </div>
@@ -62,7 +83,7 @@ export const AbstractItem: React.FC<AbstractItemProps> = ({ item, hasError, clas
       {privilegedOperator &&
         <div className='offer'>
           <label>
-            <span>{t('app.public.abstract_item.offer_product')}</span>
+            <span>{offerItemLabel || t('app.public.abstract_item.offer_product')}</span>
             <Switch
               checked={item.is_offered || false}
               onChange={handleToggleOffer(item)}
diff --git a/app/frontend/src/javascript/components/cart/cart-order-product.tsx b/app/frontend/src/javascript/components/cart/cart-order-product.tsx
index 7a541050d..d9eb28009 100644
--- a/app/frontend/src/javascript/components/cart/cart-order-product.tsx
+++ b/app/frontend/src/javascript/components/cart/cart-order-product.tsx
@@ -1,7 +1,7 @@
 import * as React from 'react';
 import FormatLib from '../../lib/format';
 import { CaretDown, CaretUp } from 'phosphor-react';
-import type { OrderProduct, OrderErrors, Order } from '../../models/order';
+import type { OrderProduct, OrderErrors, Order, ItemError } from '../../models/order';
 import { useTranslation } from 'react-i18next';
 import _ from 'lodash';
 import CartAPI from '../../api/cart';
@@ -14,22 +14,21 @@ interface CartOrderProductProps {
   className?: string,
   cart: Order,
   setCart: (cart: Order) => void,
+  reloadCart: () => Promise<void>,
   onError: (message: string) => void,
-  removeProductFromCart: (item: OrderProduct) => void,
-  toggleProductOffer: (item: OrderProduct, checked: boolean) => void,
   privilegedOperator: boolean,
 }
 
 /**
  * This component shows a product in the cart
  */
-export const CartOrderProduct: React.FC<CartOrderProductProps> = ({ item, cartErrors, className, cart, setCart, onError, removeProductFromCart, toggleProductOffer, privilegedOperator }) => {
+export const CartOrderProduct: React.FC<CartOrderProductProps> = ({ item, cartErrors, className, cart, setCart, reloadCart, onError, privilegedOperator }) => {
   const { t } = useTranslation('public');
 
   /**
    * Get the given item's errors
    */
-  const getItemErrors = (item: OrderProduct) => {
+  const getItemErrors = (item: OrderProduct): Array<ItemError> => {
     if (!cartErrors) return [];
     const errors = _.find(cartErrors.details, (e) => e.item_id === item.id);
     return errors?.errors || [{ error: 'not_found' }];
@@ -120,11 +119,13 @@ export const CartOrderProduct: React.FC<CartOrderProductProps> = ({ item, cartEr
 
   return (
     <AbstractItem className={`cart-order-product ${className || ''}`}
-                  hasError={getItemErrors(item).length > 0}
+                  errors={getItemErrors(item)}
+                  setCart={setCart}
+                  cart={cart}
+                  onError={onError}
+                  reloadCart={reloadCart}
                   item={item}
-                  removeItemFromCart={removeProductFromCart}
                   privilegedOperator={privilegedOperator}
-                  toggleItemOffer={toggleProductOffer}
                   actions={buildActions()}>
       <div className="ref">
         <span>{t('app.public.cart_order_product.reference_short')} {item.orderable_ref || ''}</span>
diff --git a/app/frontend/src/javascript/components/cart/cart-order-reservation.tsx b/app/frontend/src/javascript/components/cart/cart-order-reservation.tsx
index 7022c7c4e..17e75aa55 100644
--- a/app/frontend/src/javascript/components/cart/cart-order-reservation.tsx
+++ b/app/frontend/src/javascript/components/cart/cart-order-reservation.tsx
@@ -3,30 +3,30 @@ import type { OrderErrors, Order } from '../../models/order';
 import { useTranslation } from 'react-i18next';
 import _ from 'lodash';
 import { AbstractItem } from './abstract-item';
-import { OrderCartItem } from '../../models/order';
+import { OrderCartItemReservation } from '../../models/order';
+import FormatLib from '../../lib/format';
 
 interface CartOrderReservationProps {
-  item: OrderCartItem,
+  item: OrderCartItemReservation,
   cartErrors: OrderErrors,
   className?: string,
   cart: Order,
   setCart: (cart: Order) => void,
+  reloadCart: () => Promise<void>,
   onError: (message: string) => void,
-  removeProductFromCart: (item: OrderCartItem) => void,
-  toggleProductOffer: (item: OrderCartItem, checked: boolean) => void,
   privilegedOperator: boolean,
 }
 
 /**
  * This component shows a product in the cart
  */
-export const CartOrderReservation: React.FC<CartOrderReservationProps> = ({ item, cartErrors, className, cart, setCart, onError, removeProductFromCart, toggleProductOffer, privilegedOperator }) => {
+export const CartOrderReservation: React.FC<CartOrderReservationProps> = ({ item, cartErrors, className, cart, setCart, reloadCart, onError, privilegedOperator }) => {
   const { t } = useTranslation('public');
 
   /**
    * Get the given item's errors
    */
-  const getItemErrors = (item: OrderCartItem) => {
+  const getItemErrors = (item: OrderCartItemReservation) => {
     if (!cartErrors) return [];
     const errors = _.find(cartErrors.details, (e) => e.item_id === item.id);
     return errors?.errors || [{ error: 'not_found' }];
@@ -34,13 +34,26 @@ export const CartOrderReservation: React.FC<CartOrderReservationProps> = ({ item
 
   return (
     <AbstractItem className={`cart-order-reservation ${className || ''}`}
-                  hasError={getItemErrors(item).length > 0}
+                  errors={getItemErrors(item)}
                   item={item}
-                  removeItemFromCart={removeProductFromCart}
-                  privilegedOperator={privilegedOperator}
-                  toggleItemOffer={toggleProductOffer}>
+                  cart={cart}
+                  setCart={setCart}
+                  onError={onError}
+                  reloadCart={reloadCart}
+                  actions={<div/>}
+                  offerItemLabel={t('app.public.cart_order_reservation.offer_reservation')}
+                  privilegedOperator={privilegedOperator}>
       <div className="ref">
-        <p>Réservation {item.orderable_name}</p>
+        <p>{t('app.public.cart_order_reservation.reservation')} {item.orderable_name}</p>
+        <ul>{item.slots_reservations.map(sr => (
+          <li key={sr.id}>
+            {
+              t('app.public.cart_order_reservation.slot',
+                { DATE: FormatLib.date(sr.slot.start_at), START: FormatLib.time(sr.slot.start_at), END: FormatLib.time(sr.slot.end_at) })
+            }
+            <span>{sr.offered ? t('app.public.cart_order_reservation.offered') : ''}</span>
+          </li>
+        ))}</ul>
         {getItemErrors(item)}
       </div>
     </AbstractItem>
diff --git a/app/frontend/src/javascript/components/cart/store-cart.tsx b/app/frontend/src/javascript/components/cart/store-cart.tsx
index 708ebdcc9..aa9a56d1b 100644
--- a/app/frontend/src/javascript/components/cart/store-cart.tsx
+++ b/app/frontend/src/javascript/components/cart/store-cart.tsx
@@ -11,7 +11,7 @@ import CartAPI from '../../api/cart';
 import type { User } from '../../models/user';
 import { PaymentModal } from '../payment/stripe/payment-modal';
 import { PaymentMethod } from '../../models/payment';
-import type { Order, OrderCartItem, OrderErrors, OrderItem, OrderProduct } from '../../models/order';
+import type { Order, OrderCartItemReservation, OrderErrors, OrderProduct } from '../../models/order';
 import { MemberSelect } from '../user/member-select';
 import { CouponInput } from '../coupon/coupon-input';
 import type { Coupon } from '../../models/coupon';
@@ -53,20 +53,6 @@ const StoreCart: React.FC<StoreCartProps> = ({ onSuccess, onError, currentUser,
     }
   }, [cart]);
 
-  /**
-   * Remove the product from cart
-   */
-  const removeProductFromCart = (item) => {
-    const errors = getItemErrors(item);
-    if (errors.length === 1 && errors[0].error === 'not_found') {
-      reloadCart().catch(onError);
-    } else {
-      CartAPI.removeItem(cart, item.orderable_id, item.orderable_type).then(data => {
-        setCart(data);
-      }).catch(onError);
-    }
-  };
-
   /**
    * Check the current cart's items (available, price, stock, quantity_min)
    */
@@ -109,15 +95,6 @@ const StoreCart: React.FC<StoreCartProps> = ({ onSuccess, onError, currentUser,
     return false;
   };
 
-  /**
-   * get givean item's error
-   */
-  const getItemErrors = (item) => {
-    if (!cartErrors) return [];
-    const errors = _.find(cartErrors.details, (e) => e.item_id === item.id);
-    return errors?.errors || [{ error: 'not_found' }];
-  };
-
   /**
    * Open/closes the payment modal
    */
@@ -159,21 +136,6 @@ const StoreCart: React.FC<StoreCartProps> = ({ onSuccess, onError, currentUser,
     return cart && cart.order_items_attributes.length === 0;
   };
 
-  /**
-   * Toggle product offer
-   */
-  const toggleProductOffer = (item: OrderItem, checked: boolean) => {
-    CartAPI.setOffer(cart, item.orderable_id, item.orderable_type, checked).then(data => {
-      setCart(data);
-    }).catch(e => {
-      if (e.match(/code 403/)) {
-        onError(t('app.public.store_cart.errors.unauthorized_offering_product'));
-      } else {
-        onError(e);
-      }
-    });
-  };
-
   /**
    * Apply coupon to current cart
    */
@@ -196,22 +158,20 @@ const StoreCart: React.FC<StoreCartProps> = ({ onSuccess, onError, currentUser,
                                 cartErrors={cartErrors}
                                 cart={cart}
                                 setCart={setCart}
+                                reloadCart={reloadCart}
                                 onError={onError}
-                                removeProductFromCart={removeProductFromCart}
-                                toggleProductOffer={toggleProductOffer}
                                 privilegedOperator={isPrivileged()} />
             );
           }
           return (
-            <CartOrderReservation item={item as OrderCartItem}
+            <CartOrderReservation item={item as OrderCartItemReservation}
                                   key={item.id}
                                   className="store-cart-list-item"
                                   cartErrors={cartErrors}
                                   cart={cart}
+                                  reloadCart={reloadCart}
                                   setCart={setCart}
                                   onError={onError}
-                                  removeProductFromCart={removeProductFromCart}
-                                  toggleProductOffer={toggleProductOffer}
                                   privilegedOperator={isPrivileged()} />
           );
         })}
diff --git a/app/frontend/src/javascript/models/cart_item.ts b/app/frontend/src/javascript/models/cart_item.ts
index 56bb0d566..cedfa73ff 100644
--- a/app/frontend/src/javascript/models/cart_item.ts
+++ b/app/frontend/src/javascript/models/cart_item.ts
@@ -39,8 +39,9 @@ export interface CartItemPrepaidPack extends CartItem {
 export interface CartItemFreeExtension extends CartItem {
   free_extension: { end_at: Date }
 }
+export type CartItemReservationType = 'CartItem::MachineReservation' | 'CartItem::SpaceReservation' | 'CartItem::TrainingReservation';
 
-export type CartItemType = 'CartItem::EventReservation' | 'CartItem::MachineReservation' | 'CartItem::PrepaidPack' | 'CartItem::SpaceReservation' | 'CartItem::Subscription' | 'CartItem::TrainingReservation';
+export type CartItemType = 'CartItem::EventReservation' | 'CartItem::PrepaidPack' | 'CartItem::Subscription' | CartItemReservationType;
 
 export interface CartItemResponse {
   id: number,
diff --git a/app/frontend/src/javascript/models/order.ts b/app/frontend/src/javascript/models/order.ts
index 43bb49afa..d8ded209c 100644
--- a/app/frontend/src/javascript/models/order.ts
+++ b/app/frontend/src/javascript/models/order.ts
@@ -4,7 +4,7 @@ import { CreateTokenResponse } from './payzen';
 import { UserRole } from './user';
 import { Coupon } from './coupon';
 import { ApiFilter, PaginatedIndex } from './api';
-import { CartItemType } from './cart_item';
+import type { CartItemReservationType, CartItemType } from './cart_item';
 
 export type OrderableType = 'Product' | CartItemType;
 
@@ -13,6 +13,7 @@ export interface OrderItem {
   orderable_type: OrderableType,
   orderable_id: number,
   orderable_name: string,
+  orderable_slug: string,
   orderable_main_image_url?: string;
   quantity: number,
   amount: number,
@@ -21,14 +22,22 @@ export interface OrderItem {
 
 export interface OrderProduct extends OrderItem {
   orderable_type: 'Product',
-  orderable_slug: string,
   orderable_ref?: string,
   orderable_external_stock: number,
   quantity_min: number
 }
 
-export interface OrderCartItem extends OrderItem {
-  orderable_type: CartItemType
+export interface OrderCartItemReservation extends OrderItem {
+  orderable_type: CartItemReservationType
+  slots_reservations: Array<{
+    id: number,
+    offered: boolean,
+    slot: {
+      id: number,
+      start_at: TDateISO,
+      end_at: TDateISO
+    }
+  }>
 }
 
 export interface Order {
@@ -78,13 +87,14 @@ export interface OrderIndexFilter extends ApiFilter {
   period_to?: string
 }
 
+export interface ItemError {
+  error: string,
+  value?: string|number
+}
 export interface OrderErrors {
   order_id: number,
   details: Array<{
     item_id: number,
-    errors: Array<{
-      error: string,
-      value: string|number
-    }>
+    errors: Array<ItemError>
   }>
 }
diff --git a/app/frontend/src/stylesheets/application.scss b/app/frontend/src/stylesheets/application.scss
index 19587bfa4..9484f8cc6 100644
--- a/app/frontend/src/stylesheets/application.scss
+++ b/app/frontend/src/stylesheets/application.scss
@@ -40,6 +40,7 @@
 @import "modules/base/labelled-input";
 @import "modules/calendar/calendar";
 @import "modules/cart/cart-button";
+@import "modules/cart/cart-order-reservation";
 @import "modules/cart/store-cart";
 @import "modules/dashboard/reservations/credits-panel";
 @import "modules/dashboard/reservations/prepaid-packs-panel";
diff --git a/app/frontend/src/stylesheets/modules/cart/cart-order-reservation.scss b/app/frontend/src/stylesheets/modules/cart/cart-order-reservation.scss
new file mode 100644
index 000000000..1d24bde3d
--- /dev/null
+++ b/app/frontend/src/stylesheets/modules/cart/cart-order-reservation.scss
@@ -0,0 +1,9 @@
+.cart-order-reservation {
+  .actions:before {
+    content: ' '
+  }
+
+  .ref > ul > li > span {
+    margin-left: 1em;
+  }
+}
diff --git a/app/frontend/src/stylesheets/modules/cart/cart-product.scss b/app/frontend/src/stylesheets/modules/cart/cart-product.scss
deleted file mode 100644
index e69de29bb..000000000
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index d22916875..55c1abca5 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -4,4 +4,18 @@
 # This is a single spot to configure app-wide model behavior.
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
-end
\ No newline at end of file
+
+  # Update attributes with validation context.
+  # In Rails you can provide a context while you save, for example: `.save(:step1)`, but no way to
+  # provide a context while you update. This method just adds the way to update with validation
+  # context.
+  #
+  # @param attributes [Hash] attributes to assign
+  # @param context [*] validation context
+  def update_with_context(attributes, context)
+    with_transaction_returning_status do
+      assign_attributes(attributes)
+      save(context: context)
+    end
+  end
+end
diff --git a/app/models/cart_item/event_reservation.rb b/app/models/cart_item/event_reservation.rb
index a13e03b8b..97232cacf 100644
--- a/app/models/cart_item/event_reservation.rb
+++ b/app/models/cart_item/event_reservation.rb
@@ -2,6 +2,8 @@
 
 # An event reservation added to the shopping cart
 class CartItem::EventReservation < CartItem::Reservation
+  self.table_name = 'cart_item_event_reservations'
+
   has_many :cart_item_event_reservation_tickets, class_name: 'CartItem::EventReservationTicket', dependent: :destroy,
                                                  inverse_of: :cart_item_event_reservation,
                                                  foreign_key: 'cart_item_event_reservation_id'
diff --git a/app/models/cart_item/machine_reservation.rb b/app/models/cart_item/machine_reservation.rb
index 790244d8a..84db18ce4 100644
--- a/app/models/cart_item/machine_reservation.rb
+++ b/app/models/cart_item/machine_reservation.rb
@@ -2,8 +2,6 @@
 
 # A machine reservation added to the shopping cart
 class CartItem::MachineReservation < CartItem::Reservation
-  self.table_name = 'cart_item_reservations'
-
   has_many :cart_item_reservation_slots, class_name: 'CartItem::ReservationSlot', dependent: :destroy, inverse_of: :cart_item,
                                          foreign_key: 'cart_item_id', foreign_type: 'cart_item_type'
   accepts_nested_attributes_for :cart_item_reservation_slots
diff --git a/app/models/cart_item/reservation.rb b/app/models/cart_item/reservation.rb
index 36d137b7e..088b94e0b 100644
--- a/app/models/cart_item/reservation.rb
+++ b/app/models/cart_item/reservation.rb
@@ -1,13 +1,11 @@
 # frozen_string_literal: true
 
-MINUTES_PER_HOUR = 60.0
-SECONDS_PER_MINUTE = 60.0
-
-GET_SLOT_PRICE_DEFAULT_OPTS = { has_credits: false, elements: nil, is_division: true, prepaid: { minutes: 0 }, custom_duration: nil }.freeze
-
 # A generic reservation added to the shopping cart
 class CartItem::Reservation < CartItem::BaseItem
-  self.abstract_class = true
+  MINUTES_PER_HOUR = 60.0
+  SECONDS_PER_MINUTE = 60.0
+
+  GET_SLOT_PRICE_DEFAULT_OPTS = { has_credits: false, elements: nil, is_division: true, prepaid: { minutes: 0 }, custom_duration: nil }.freeze
 
   def reservable
     nil
diff --git a/app/models/cart_item/space_reservation.rb b/app/models/cart_item/space_reservation.rb
index 145c84289..d8859504d 100644
--- a/app/models/cart_item/space_reservation.rb
+++ b/app/models/cart_item/space_reservation.rb
@@ -2,8 +2,6 @@
 
 # A space reservation added to the shopping cart
 class CartItem::SpaceReservation < CartItem::Reservation
-  self.table_name = 'cart_item_reservations'
-
   has_many :cart_item_reservation_slots, class_name: 'CartItem::ReservationSlot', dependent: :destroy, inverse_of: :cart_item,
                                          foreign_key: 'cart_item_id', foreign_type: 'cart_item_type'
   accepts_nested_attributes_for :cart_item_reservation_slots
diff --git a/app/services/cart/add_item_service.rb b/app/services/cart/add_item_service.rb
index 2e4a2ed44..392356c6f 100644
--- a/app/services/cart/add_item_service.rb
+++ b/app/services/cart/add_item_service.rb
@@ -29,7 +29,7 @@ class Cart::AddItemService
   def add_product(order, orderable, quantity)
     raise Cart::InactiveProductError unless orderable.is_active
 
-    item = order.order_items.find_by(orderable: orderable)
+    item = order.order_items.find_by(orderable_type: orderable.class.name, orderable_id: orderable.id)
     quantity = orderable.quantity_min > quantity.to_i && item.nil? ? orderable.quantity_min : quantity.to_i
 
     if item.nil?
@@ -43,6 +43,6 @@ class Cart::AddItemService
   end
 
   def add_cart_item(order, orderable)
-    order.order_items.new(quantity: 1, orderable: orderable, amount: orderable.price[:amount] || 0)
+    order.order_items.new(quantity: 1, orderable_type: orderable.class.name, orderable_id: orderable.id, amount: orderable.price[:amount] || 0)
   end
 end
diff --git a/app/services/cart/create_cart_item_service.rb b/app/services/cart/create_cart_item_service.rb
index a7d9f20b7..a4654b29c 100644
--- a/app/services/cart/create_cart_item_service.rb
+++ b/app/services/cart/create_cart_item_service.rb
@@ -3,11 +3,11 @@
 # Provides methods to create new cart items, based on an existing Order
 class Cart::CreateCartItemService
   def initialize(order)
-    raise Cart::AnonymousError if order.statistic_profile.nil? || order.operator_profile.nil?
+    raise Cart::AnonymousError, I18n.t('cart_validation.select_user') if order.statistic_profile.nil? || order.operator_profile.nil?
 
     @order = order
     @customer = order.user
-    @operator = order.user.privileged? ? order.operator_profile.user : order.user
+    @operator = order.operator_profile.user
   end
 
   def create(item)
diff --git a/app/services/cart/refresh_item_service.rb b/app/services/cart/refresh_item_service.rb
index 143df6e12..1cbf3e786 100644
--- a/app/services/cart/refresh_item_service.rb
+++ b/app/services/cart/refresh_item_service.rb
@@ -5,7 +5,7 @@ class Cart::RefreshItemService
   def call(order, orderable)
     raise Cart::InactiveProductError unless orderable.is_active
 
-    item = order.order_items.find_by(orderable: orderable)
+    item = order.order_items.find_by(orderable_type: orderable.class.name, orderable_id: orderable.id)
 
     raise ActiveRecord::RecordNotFound if item.nil?
 
diff --git a/app/services/cart/remove_item_service.rb b/app/services/cart/remove_item_service.rb
index 01d8d01fe..a20590f23 100644
--- a/app/services/cart/remove_item_service.rb
+++ b/app/services/cart/remove_item_service.rb
@@ -3,7 +3,7 @@
 # Provides methods for remove order item to cart
 class Cart::RemoveItemService
   def call(order, orderable)
-    item = order.order_items.find_by(orderable: orderable)
+    item = order.order_items.find_by(orderable_type: orderable.class.name, orderable_id: orderable.id)
 
     raise ActiveRecord::RecordNotFound if item.nil?
 
diff --git a/app/services/cart/set_customer_service.rb b/app/services/cart/set_customer_service.rb
index d3135c395..4ba9263ac 100644
--- a/app/services/cart/set_customer_service.rb
+++ b/app/services/cart/set_customer_service.rb
@@ -5,10 +5,13 @@ module Cart; end
 
 # Provides methods to update the customer of the given cart
 class Cart::SetCustomerService
+  # @param operator [User]
   def initialize(operator)
     @operator = operator
   end
 
+  # @param order[Order]
+  # @param customer [User]
   def call(order, customer)
     return order unless @operator.privileged?
 
@@ -19,6 +22,9 @@ class Cart::SetCustomerService
     ActiveRecord::Base.transaction do
       order.statistic_profile_id = customer.statistic_profile.id
       order.operator_profile_id = @operator.invoicing_profile.id
+      order.order_items.each do |item|
+        update_item_user(item, customer)
+      end
       unset_offer(order, customer)
       Cart::UpdateTotalService.new.call(order)
       order.save
@@ -26,7 +32,11 @@ class Cart::SetCustomerService
     order.reload
   end
 
+  private
+
   # If the operator is also the customer, he cannot offer items to himself, so we unset all the offers
+  # @param order[Order]
+  # @param customer [User]
   def unset_offer(order, customer)
     return unless @operator == customer
 
@@ -35,4 +45,15 @@ class Cart::SetCustomerService
       item.save
     end
   end
+
+  # @param item[OrderItem]
+  # @param customer [User]
+  def update_item_user(item, customer)
+    return unless item.orderable_type.match(/^CartItem::/)
+
+    item.orderable.update_with_context({
+                                         customer_profile_id: customer.invoicing_profile.id,
+                                         operator_profile_id: @operator.invoicing_profile.id
+                                       }, item.order.order_items)
+  end
 end
diff --git a/app/services/cart/set_offer_service.rb b/app/services/cart/set_offer_service.rb
index 18a18c706..1712ab12b 100644
--- a/app/services/cart/set_offer_service.rb
+++ b/app/services/cart/set_offer_service.rb
@@ -6,7 +6,7 @@ module Cart; end
 # Provides methods for set offer to item in cart
 class Cart::SetOfferService
   def call(order, orderable, is_offered)
-    item = order.order_items.find_by(orderable: orderable)
+    item = order.order_items.find_by(orderable_type: orderable.class.name, orderable_id: orderable.id)
 
     raise ActiveRecord::RecordNotFound if item.nil?
 
diff --git a/app/services/cart/set_quantity_service.rb b/app/services/cart/set_quantity_service.rb
index 545ff99b3..5e9bf11eb 100644
--- a/app/services/cart/set_quantity_service.rb
+++ b/app/services/cart/set_quantity_service.rb
@@ -9,7 +9,7 @@ class Cart::SetQuantityService
 
     raise Cart::OutStockError if quantity.to_i > orderable.stock['external']
 
-    item = order.order_items.find_by(orderable: orderable)
+    item = order.order_items.find_by(orderable_type: orderable.class.name, orderable_id: orderable.id)
 
     raise ActiveRecord::RecordNotFound if item.nil?
 
diff --git a/app/services/cart/update_total_service.rb b/app/services/cart/update_total_service.rb
index 24dec77e2..eec745caa 100644
--- a/app/services/cart/update_total_service.rb
+++ b/app/services/cart/update_total_service.rb
@@ -2,13 +2,24 @@
 
 # Provides methods for update total of cart
 class Cart::UpdateTotalService
+  # @param order[Order]
   def call(order)
     total = 0
     order.order_items.each do |item|
+      update_item_price(item)
       total += (item.amount * item.quantity) unless item.is_offered
     end
     order.total = total
     order.save
     order
   end
+
+  private
+
+  # @param item[OrderItem]
+  def update_item_price(item)
+    return unless item.orderable_type.match(/^CartItem::/)
+
+    item.update(amount: item.orderable.price[:amount] || 0)
+  end
 end
diff --git a/app/views/api/orders/_cart_item_reservation.json.jbuilder b/app/views/api/orders/_cart_item_reservation.json.jbuilder
new file mode 100644
index 000000000..0ebddb76b
--- /dev/null
+++ b/app/views/api/orders/_cart_item_reservation.json.jbuilder
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+json.orderable_name item.orderable.reservable.name
+json.orderable_slug item.orderable.reservable.slug
+json.orderable_main_image_url item.orderable.reservable&.try("#{item.orderable.reservable_type.downcase}_image")&.attachment&.medium&.url
+json.slots_reservations item.orderable.cart_item_reservation_slots do |sr|
+  json.extract! sr, :id, :offered
+  json.slot do
+    json.extract! sr.slot, :id, :start_at, :end_at
+  end
+end
diff --git a/app/views/api/orders/_order.json.jbuilder b/app/views/api/orders/_order.json.jbuilder
index 16afd0486..45e83fc82 100644
--- a/app/views/api/orders/_order.json.jbuilder
+++ b/app/views/api/orders/_order.json.jbuilder
@@ -28,4 +28,7 @@ json.order_items_attributes order.order_items.order(created_at: :asc) do |item|
   json.amount item.amount / 100.0
   json.is_offered item.is_offered
   json.partial! 'api/orders/product', item: item if item.orderable_type == 'Product'
+  if %w[CartItem::MachineReservation CartItem::SpaceReservation CartItem::TrainingReservation].include?(item.orderable_type)
+    json.partial! 'api/orders/cart_item_reservation', item: item
+  end
 end
diff --git a/config/locales/app.public.en.yml b/config/locales/app.public.en.yml
index 68685ca59..4e23e6abf 100644
--- a/config/locales/app.public.en.yml
+++ b/config/locales/app.public.en.yml
@@ -446,6 +446,8 @@ en:
       abstract_item:
         offer_product: "Offer the product"
         total: "Total"
+        errors:
+          unauthorized_offering_product: "You can't offer anything to yourself"
       cart_order_product:
         reference_short: "ref:"
         minimum_purchase: "Minimum purchase: "
@@ -458,7 +460,11 @@ en:
           stock_limit_QUANTITY: "Only {QUANTITY} {QUANTITY, plural, =1{unit} other{units}} left in stock, please adjust the quantity of items."
           quantity_min_QUANTITY: "Minimum number of product was changed to {QUANTITY}, please adjust the quantity of items."
           price_changed_PRICE: "The product price was modified to {PRICE}"
-          unauthorized_offering_product: "You can't offer anything to yourself"
+      cart_order_reservation:
+        reservation: "Reservation"
+        offer_reservation: "Offer the reservation"
+        slot: "{DATE}: {START} - {END}"
+        offered: "offered"
       orders_dashboard:
         heading: "My orders"
         sort:
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 3297408fc..ad0ff3bda 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -524,6 +524,8 @@ en:
     space: "This space is disabled"
     machine: "This machine is disabled"
     reservable: "This machine is not reservable"
+  cart_validation:
+    select_user: "Please select a user before continuing"
   settings:
     locked_setting: "the setting is locked."
     about_title: "\"About\" page title"
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index b40b069dd..b4dede18f 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -518,6 +518,8 @@ fr:
     space: "Cet espace est désactivé"
     machine: "Cette machine est désactivée"
     reservable: "Cette machine n'est pas réservable"
+  cart_validation:
+    select_user: "Veuillez sélectionner un utilisateur avant de continuer"
   settings:
     locked_setting: "le paramètre est verrouillé."
     about_title: "Le titre de la page \"À propos\""