How to process IDOC transaction (MIRO) in the foreground

I am trying to get the automatic vendor invoice (part of the inter company sales process) working, but failed so far.

I am now at the process the incoming IDOC is processed but ends with an error 51. Every time I solve a problem a new error 51 appears. The question is, is it possible to carry out the transaction (I think it is MIRO, function module IDOC_INPUT_INVOIC_FI) in the foreground.

I tried with WE19 selecting the appropriate function module IDOC_INPUT_INVOIC_FI and execute in the foreground, but unfortunately it transferred the IDOC and that one ends with the same error 51 again.

So what I would like to have, suppose MIRO is used, it starts MIRO in the foreground and shows which data from the IDOC is entered and processed. In that way I can oversee all the possible errors at once.

By the way: At this stage I don't really know whether MIRO is used, because there is no Purchase order nor Goods receipt.How can I check which transaction is triggerd?

Regards kees