If fulfillment is the last to pull an item from open stock, they aren't the ones creating unlocated items. That's more likely caused by someone backstocking and getting the counts wrong. Now, if fulfillment is pulling from closed stock and not properly locating the remainder, that's an issue. The best solution is to just go caseless, which also makes one for ones a lot easier. Fulfillment hitting AIS without scanning everything is another possible issue, but that just begs the questions why wasn't what they were looking for in the proper location and/or why were there so many DPCIs in one location that not everything got scanned? (My tech team is notorious for that. They have an ocean of empty wacos, yet somehow ALL the popsockets are tossed into one waco. All iPhone cords? One waco. All screen protectors? One waco. All Skullcandy headphones? One waco. Videos games? Let's just see how many we can stuff into the same waco before it bursts!
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Everyone loves to blame fulfillment for their backroom errors. I've gone through it many times with my ETL, almost everything that DBOs blame fulfillment for can actually be traced to someone else's error outside of new fulfillment seasonals doing dumb things. ASANTS on that of course.