Call the same search method in super call when extending for components

Closes #12434

modules/product_kit/purchase.py

@@ -41,7 +41,7 @@ class Purchase(order_mixin('purchase'), metaclass=PoolMeta):
     @classmethod
     @search_shipments_returns('stock.shipment.in.return')
     def search_shipment_returns(cls, name, clause):
-        return super().search_shipments(name, clause)
+        return super().search_shipment_returns(name, clause)
 
     @get_moves
     def get_moves(self, name):

modules/product_kit/sale.py

@@ -41,7 +41,7 @@ class Sale(order_mixin('sale'), metaclass=PoolMeta):
     @classmethod
     @search_shipments_returns('stock.shipment.out.return')
     def search_shipment_returns(cls, name, clause):
-        return super().search_shipments(name, clause)
+        return super().search_shipment_returns(name, clause)
 
     @get_moves
     def get_moves(self, name):