Net value (KOMP-NETWR) not calculated correctly

Hello,

I defined a simple SD pricing procedure as follow:

Pos	Condition type		Reference
10	VKP0	Sales price	
20		Sales price	10
30	MWSI	value added tax	20

There is a sales price condition VKP0 and MWSI as VAT; by creating a sales order (VA01) the pricing procedure will be performed. VKP0 will be determined correctly, MWSI will be calculated correctly; in the pricing procedure itself there is no condition type or subtotal with net value.

Now the net value (KOMP-NETWR) should be calculated implicitly (shown in the item detail), but the net value contains the sales price.

What could be the problem? What must be considered to calculate the net value?

Thanks for your hint and approaches.

Best regards,

Kurt.