Billing Enhancement - Condition Types

Hi Friends,

I have got a requirement to determine condition types based on certain conditions through exits in VF01. The sceanrio is something like this...

For each line item from a delivery document i got to determine condition types by cross-checking a z table. I tried using Subroutine exit 'USER_FILL_VBRK_VBRP'. What happens here is that if we have 2 line items, the user exit populates the condition types for the first line item and the second line item remains unchanged. I guess we have a sequence problem here.. Correct me if iam wrong. The condition types in standard program is determined by a function module by name 'Pricing_Copy' which executes after this subroutine exit.

Do we have any other exits where i can code so that the condition types are in place.

Prompt replies would be rewarded.

Regards,

Tamilarasan.