I have this IC Billing done for customer X/Material Y and Item category ZMTO for which the posting is ok. but when i use same details but a different item cateogry i get an error POSTING REQUIRES TP WITH LEDGER ACCOUNT. I know this is a custom error but i would like to know what is going wrong here. I dnt have access to ABAP team. Can somebody guide me what is going wrong here. what is missing?