POS fires the EVENT_TXN_MERCH_PRE right before adding an item record to the TList, giving the User Exit component a chance to reject (block) the sale of an item. This is done after the scanned item's data had been sent to the prompt box and to the customer's display.
SAP Point-of-Sale 2.3
KBA , IS-R-TGM-POS , Transactionware GM-POS , Problem
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