Managing balance in retention
          The retention balance is tracked per Subcontracting Procurement Order and Invoice-From BP. The balance amount is displayed for the Invoice-from BP and department combination. Bookings are processed when:
         
         - Changing the retention deducted amount on the AFP
            
- Counter booking for the deducted retention amount for the old value.
 - Booking for the deducted retention amount.
 
 - Changing the gross retention approved amount on the AFP or the retention release
            
- Counter booking for the approved retention amount for the old value.
 - Booking for the approved retention amount.