Your warehouse management system says the part is in Bin A-127. You walk to A-127 and it's not there. Someone moved it two months ago and never updated the system. Now you're walking the aisles looking for it while a customer order waits. This scenario plays out multiple times per day in warehouses everywhere, destroying productivity and frustrating workers.
The problem gets worse during reorganizations. You need to move 200 items from one area to another. That means 200 individual updates in your system - each requiring you to look up the item, find the location field, change it, save, and repeat. The process takes hours. People skip steps. Locations become inaccurate. Three months later, nobody trusts the location data anymore.
Physical inventory counts reveal the extent of the problem. Items are everywhere except where the system says they should be. You find $50,000 worth of parts that were 'missing' - they were just in the wrong location and nobody could find them. You discover you've been purchasing parts you already own because the location data was so unreliable that people assumed you were out of stock.
The impact on operations is massive. Pick times double because workers don't trust the system and check multiple locations. New employees can't find anything without asking veterans who've memorized where things actually are (versus where the computer says they are). Customer shipments are delayed. Rush shipping costs increase because you can't find parts in time for regular shipping. Everyone knows the location data is wrong, but keeping it updated seems impossible.