<Item type=”PlanCodes” action=”get” select=”id” doGetItem=”0″><keyed_name>AA</keyed_name></Item>
directly through AML Studio or Nash (which you can get to by adding /Client/Scripts/nash.aspx to the end of your usual Innovator URL).
Additionally, could you try to remove the doGetItem attribute from that AML? It's contradictory to include when using the get action.
Chris