Output type for printout goes to the printer that has been assigned to :
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ZMMPUR_PRNT_OUT table maintained separately
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Vendor Master Data
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Purchasing Group
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Chart of accounts
In SAP purchasing output determination, the output type for printout (such as a purchase order message) is routed to a printer that has been assigned to a specific organizational unit. The Purchasing Group is one such unit that can have an assigned printer for output processing. Options like ZMMPUR_PRNT_OUT table (not standard), Vendor Master Data (vendor records don't assign printers), and Chart of Accounts (finance-related) are not correct for purchasing output printer assignment.
In SAP, output/message determination for purchasing documents typically routes the printout to the printer configured against the Purchasing Group responsible for that document, since the purchasing group represents the buyer/department handling procurement, not the vendor or a separate print table.