The Message Determination Facility is by default active and message determination schema is supplied for all purchasing documents including POs, PRs, RFQs etc.
All of the desired message types must be maintained. Choose Master data –> Messages –> Purchasing document –> Create or Change from the Purchasing menu. Add the message type and pick the key combination. The key combination decides the condition table where the condition record is stored. Enter all needed items. Next screen, create the individual condition records. Using the menu options Goto –> Means of Communication, enter the proper peripheral, or output for each message record. Save.