add parent to distributios

apps/product/models.py

@@ -530,6 +530,12 @@ class QuotaLiveStockAgeLimitation(BaseModel):
 
 
 class QuotaDistribution(BaseModel):
+    parent_distribution = models.ForeignKey(
+        'self',
+        on_delete=models.CASCADE,
+        related_name='parent',
+        null=True
+    )
     assigner_organization = models.ForeignKey(
         Organization,
         on_delete=models.CASCADE,