After my the last article, I’ve got comments about FEFO. First, thanks for reading my blog :), and then yes, it deserves to write a few sentences about it, because it is very useful feature in NAV.

But first, what actually FEFO means? It is First-Expired-First-Out method. What is the first we have to notice about it? FEFO is a picking method, but it is not a costing method. This method is important for a lot of very specific industries (pharmacy, food…), but it is just one specific way how to configure your location.

If you want to use FEFO, your items have to have configured a serial or/and lot numbers. In additional on each item tracking code setup, the SN-Specific Warehouse Tracking field or the Lot-Specific Warehouse Tracking field must be selected. And now, we can conclude that FEFO actually uses Specific Costing Method. It is FEFO, but it is nothing more then Specific method. Everything is the same as in all other Specific Method types, but when you select FEFO on your location, system will take care about picking order using expiration date.

You can find more about FEFO on MSDN here or in Mark Brummel Application Design book.