Accouting document posted with zero net value

Hello,

I have created a new pricing condition type ZXXX which will give 100% discount in the sales order to make net value 0.00. When I create a billing document, the net value is 0.00 but the accounting document is still getting created. Basically, the system is posting Debit/Credit to the same account with same amount.

My Client requirement is that we dont want accounting document created for these order types with 100% discount.

I serached the forum but did not find any specific config where we control this. Any suggestions will be very useful for me.

Manoj.