I'm using a user exit EXIT_SAPLWPUE_131 during POS inbound processing for IDOC WPUFIB. I am trying to simulate a down payment from a customer...ta F.29. Has anyone used this user exit or any other to create a down payment? If so, could you list which fields were used during the interface. The only one I am populating at the moment is the Special G/L indicator...ACCIT-UMSKZ.