A blog reader has asked me for help about an allegedly strange behavior of items with serial number tracking. They had a customer who had serial number tracking switched on for an item with FIFO costing method. Whenever they posted a sales transaction, they chose the serial number manually. Then they noticed a puzzling behavior.
No matter the specification of the serial number on the sales lines, Microsoft Dynamics NAV seemed to be closing the item entries according to FIFO method. This effectively allowed a serial number to be sold twice (or more). They called for help.