add - whole system of inventory entry in organization quotas stat

apps/warehouse/models.py

@@ -19,6 +19,12 @@ class InventoryEntry(BaseModel):
         related_name='inventory_entry',
         null=True
     )
+    quota = models.ForeignKey(
+        product_models.Quota,
+        on_delete=models.CASCADE,
+        related_name='inventory_entry',
+        null=True
+    )
     organization = models.ForeignKey(
         product_models.Organization,
         on_delete=models.CASCADE,
@@ -38,7 +44,7 @@ class InventoryEntry(BaseModel):
         # prefix = "POS"
         while True:
             number_part = ''.join(random.choices(string.digits, k=6))
-            code = f"{self.distribution.quota.quota_id}{number_part}"
+            code = f"{self.quota.quota_id}{number_part}"
             if not InventoryEntry.objects.filter(entry_identity=code).exists():
                 return code