changes

fusion_rental/wizard/rental_return_wizard.py

@@ -76,6 +76,12 @@ class RentalReturnWizard(models.TransientModel):
                 'qty_to_return': line.qty_delivered - line.qty_returned,
             }))
 
+        if not lines_vals:
+            raise UserError(_(
+                "No items are available for return. Either nothing has been "
+                "delivered or all items have already been returned."
+            ))
+
         res['line_ids'] = lines_vals
         return res
 
@@ -84,6 +90,12 @@ class RentalReturnWizard(models.TransientModel):
         self.ensure_one()
         order = self.order_id
 
+        if not order._has_completed_delivery():
+            raise UserError(_(
+                "Cannot process return: no delivery has been completed "
+                "for this order."
+            ))
+
         if not self.inspection_photo_ids:
             raise UserError(_(
                 "Inspection photos are required. Please attach at least one "