Travel Management mapping to fi posting long text

Hello,

I have been tasked to have the description field from PR05 for each expense item added to the FI posting documents long text field.  I have search all the travel management Badi's in SPRO and have not found a solution and done many google searches. My closest guess so far is to use the Badi: Adjustments for Account Determination under Posting. I have implemented the Badi TRIP_POST_FI for the method MODIFY_PTRV_DOC_IT for the purposes of writing to the PTRV_DOC_IT parameter for the SGTXT field.  This posts to FI, but not in the long text field. It seems I do not have access to the long text field on the FI side.  Maybe this is a Core mod change?

Any assistance is appreciated.

Thanks, Brian