We would like to use the AMEX Reference ID (AMEX transaction number) when booking via the company credit card. This is to be entered/moved in the field assignment (BSEG-ZUONR) when booking the Travel expense booking.

I see in SAP / ERP, CTE_SETUP – Financial posting -  BADI Implementation there is the extension report ES_CTE_FIN_POSTING_DATA with different BADIs for the financial posting.

One BADI could be BADI_CTE_FIN_POST_DATA_CHANGE - Enhance Incoming Posting Data from Concur

In Concur, in which field is the AMEX transaction number used so that we can map it to the BSEG-ZUONR mapping field?

Best regards
Thomas