[IMP] Remove domain from onchange method and put it in field view

rma/models/rma_order_line.py

@@ -730,7 +730,7 @@ class RmaOrderLine(models.Model):
             )
         if self.lot_id.product_id != self.product_id:
             self.lot_id = False
-        return {"domain": {"lot_id": [("product_id", "=", self.product_id.id)]}}
+        return result
 
     @api.onchange("operation_id")
     def _onchange_operation_id(self):

rma/views/rma_order_line_view.xml

@@ -203,6 +203,7 @@
                                 groups="stock.group_production_lot"
                                 attrs="{'required': [('product_tracking', 'in', ('serial', 'lot'))]}"
                                 context="{'default_product_id': product_id,}"
+                                domain="[('product_id', '=', product_id)]"
                             />
                                 <field name="under_warranty" />
                             </group>