Pricing Error in Billing document

Hi All,

I have an urgent Requirement....got an error during pricing. Using a new feild POSEX i have maintained Rate. In Scheduling Agreement i have to manually update to get the net value....? In billing i am not getting the net value.....system is not able to read the condition for POSEX. Even though i manually update the net value is zero......Kindly give a solution at the earliest....as m in golive stage.

REgards

Kishan