Explain the Transaction Keys in MM?

Also known as process keys, the Transaction Keys are pre-defined in the system to enable transaction postings in Inventory Management and Accounting (Invoice Verification). For each of the movement types in MM, there is a value string that stores these possible transactions.

The pre-defined transaction keys are:

􀂃 BSX (used in Inventory Postings)

􀂃 WRX (used in GR/IR Clearing Postings)

􀂃 PRD (used to post Cost/Price differences)

􀂃 UMB (used to post Revenue/Expenses from revaluation)

􀂃 GBB (used in offsetting entries in Stock postings)

BSX, WRX, and PRD are examples of transaction keys that are relevant for a GR with reference to a purchase order for a material with standard price control. The transaction key UMB is used when the standard price has changed and the movement is posted to a previous period. Likewise, GBB is used to identify the GL account to post to as the offsetting entry to the stock account (when not referencing a purchase order) such as miscellaneous goods receipts, goods issues for sales orders with no account assignment, and scrapping.