Free of charge sales for configurable material

Hello ,

Our business wants to make a free of charge delivery for configurable material.

I have created new item catagory copied from TAC and kept relevant for pricing as blank, Billing relevance as - "F" and statastical value as "Y" - (No cumulation- value can be used statistically) and incompleteness procedure as 24- Free of charge. Rest of the settings are as it is.

Now when i create the sales order for free of charge order the Net value for the configurable material becomes '0' but it asks me for to maintained subtotal 1 though the order and item catagory is free of charge.

Please suggest how can i deliver confighurable material as free of charge.

Please suggest

Thanks in advance

Mazhar