Delivery document available in VKDFS table. How to remove that?

Hi,

The scenario goes like this. I create purchase order,goods receipt and invoice. followed by which i create a return delivery for one line item . Now this return delivery gets added in VKDFS table. The reason is because billingtype is IV(Intercompany billing).

Item category of delivery is RLLN(Relevant for proforma). generally item category relevant for proforma doesnt get added in VKDFS. But since this is intercompany billing it is added in VKDFS.

Now my doubt is how or where do we give the billing type for delivery document.I mean where do we assign Intercompany billing to delivery document.....