How to edit part type in the aras using AML

Hi Guys, I want to update the part type using AML query. I am getting response as success but on UI i am not able to see the changed part type. e.g i want to change part type from "Assembly" to "Commodity" AML query which i am using to edit - <AML> <Item type="Part" action="edit" where="part.item_number ='P10226-1'"> <m_part_type>Commodity</m_part_type> </Item> </AML>   Please correct the above AML, i am not able to edit part.