Tracking POSDM transactions in IS-Retail

Hello Respected Experts,

I'm in a crunch with a problem.

I have certain transactions with taxes and discounts. They have processed ok in POSDM - as per the WorkBench(/posdw/mon0)

Now I'm trying to trace the IDOC (WPUUMS) using BD87.

Need to trace particular transactions from POSDM all the way into IS RETAIL and how the Billing Document (VF05) gets posted.

Please help, Appreciate you time and attention in advance,

Thanks,

Andy