Item category change - Return order with reference to preceding sales order

Hi,

I have tried to set up in VTAA that a return order type (ZX05) with reference to a sales order type (ZX02) should get a certain item category (ZREN) on line items. But when I try to create a return order of this type, the item category is picked based on the item category from the preceding sales order. Shouldn't the setup in VTAA overrule the system's built in preference? Is there any additional setup I need to do before this will work properly?

Thanks in advance,

Eirik