I am trying to post a TBB4 document with tax code. I have maintained table V_AT210 including accounting Key "MWS" for the output tax but still gets that error any time I execute TBB4. My impression was that after maintaining table V_AT210 the posting interface to accounting should allow me to enter the tax code or pick it up from the the table.
Do I need to setup derivation procedure with the same tax code in TRM and place this in other flows during contract setup?
Can someone give me guidance if anyone has handled tax posting through the TRM-FI posting interface.