diff --git a/models/sale_order.py b/models/sale_order.py
index 857101d..a81e309 100644
--- a/models/sale_order.py
+++ b/models/sale_order.py
@@ -11,4 +11,17 @@ class SaleOrder(models.Model):
     def _compute_website_order_line(self):
         self.website_order_line = self.order_line.filtered(
             lambda t: not t.pack_parent_line_id.exists(),
-        )
\ No newline at end of file
+        )
+
+    @api.multi
+    def _cart_update(self, product_id=None, line_id=None, add_qty=0, set_qty=0, **kwargs):
+        self.ensure_one()
+        if line_id is not False:
+            order_line = self.env['sale.order.line'].browse(line_id)
+        
+            # order_line = self._cart_find_product_line(product_id, line_id, **kwargs)[:1]
+            if order_line.pack_parent_line_id:
+                return {'line_id': order_line.id, 'quantity': 0}
+        
+        return super(SaleOrder, self)._cart_update(product_id, line_id, add_qty, set_qty, **kwargs)
+        
\ No newline at end of file