BAPI_ACC_DOCUMENT_POST issue with posting key

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We have an issue where we have developed our own Credit Card payment system using a web front end, interfaced through SAP XI (3.0 - SP15) and using ACC_DOCUMENT_POST to post the transactional data (into SAP R/3 Enterprise) to the customer record and the credit card clearing account.

With the current set up it is posting the debit and credit entry okay, however, it has been noticed that it is being posted to posting key 11 (Credit memo)a nd we want to use Posting key 15 (incoming payment).

This field is not available in the BAPI. We have a specific document type that is used to post this credit card receipt.

Is there a away to change the posting key?

I have tried changing the BUS_ACT to RMRP (Failed) and SD00 (Posting key 11 used) so am no further foward.

I have tried amending OBU1 for Transaction F-02 to Document Type DA and Posting Key 15, but this has not worked, either....

Maybe a Substitution or Validation needed??

Any thoughts?

Any suggestions gratefully received!