diff --git a/back-openapi.yaml b/back-openapi.yaml
index 3e1eac8bcd0880dbcf0b8737901b6584c6dfaaf8..12e5231338aba0b139c92a03fe9b5e3e717fcc11 100644
--- a/back-openapi.yaml
+++ b/back-openapi.yaml
@@ -1,6 +1,6 @@
 openapi: "3.0.0"
 info:
-  version: 0.0.1-20210924
+  version: 0.0.1-20210926
   title: SIL ERP BACK
   description: Interface API between the SIL ERP services and the BACK component.
 #  termsOfService: https://git.unistra.fr/erp-sil/back
@@ -70,6 +70,26 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/ErrorMessage'
+  /retrieveStocks:
+    get:
+      description: |
+        Returns the stocks for each item (their quantity).
+      operationId: retrieveStocks
+      responses:
+        '200':
+          description: List of stock entries.
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Stock'
+        '500':
+          description: Internal Server Error
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ErrorMessage'
   /submitTransaction:
     post:
       description: Submits a new transaction into the system.
@@ -134,22 +154,44 @@ components:
         subscriberPrice:
           type: number
           example: 0.8
+    Stock:
+      type: object
+      required:
+        - id
+        - itemId
+        - itemName
+        - quantity
+      properties:
+        id:
+          type: integer
+          example: 1
+        itemId:
+          type: integer
+          example: 1
+        itemName:
+          type: string
+          example: "Jus d'orange"
+        quantity:
+          type: integer
+          example: 25
     Transaction:
       type: object
       required:
         - item
+        - type
         - quantity
-        - amount
       properties:
         item:
           type: integer
           example: 1
+        type:
+          type: integer
+          description: ACHAT, REGLEMENT, VENTE, ENCAISSEMENT
+          enum: [1, 2, 3, 4]
+          example: 1
         quantity:
           type: integer
           example: 5
-        amount:
-          type: number
-          example: 4.0
     ErrorMessage:
       type: object
       required:
diff --git a/src/main/java/fr/unistra/sil/erp/back/model/Transaction.java b/src/main/java/fr/unistra/sil/erp/back/model/Transaction.java
index 57efe19f8c4fe71b4d1029c7b3e26d108c90ac88..cfdc6e4887757fc8bc71432b5b384f773d400716 100644
--- a/src/main/java/fr/unistra/sil/erp/back/model/Transaction.java
+++ b/src/main/java/fr/unistra/sil/erp/back/model/Transaction.java
@@ -4,8 +4,6 @@
  */
 package fr.unistra.sil.erp.back.model;
 
-import java.math.BigDecimal;
-
 /**
  * Representation of a transaction.
  *