One of the top causes of Inventory Inaccuracy is Back Stock. Many times SKUs with Back Stock will sell out on the shelf and then be zeroed out when doing routine shooting outs thereby creating false shrinkage and permanent overstock. To counteract this, we recommend a periodic purge of back rooms and top stock.
This purging process involves bringing all Back Stock (and/or Top Stock) to the sales floor, fill any holes and then account for its accuracy. Once you are confident you have found every item for a SKU then get a total count, enter it into PIP, fill the shelf as much as possible and then take the remainder back to its back stock location. Don't be surprised if you discover a lot of items with wrong counts! Use the link below to print "Additional Product Available" tags to help identify SKUs in a Back Stock condition.  

Advanced: consider limiting Order Points (ROP Protect) or increasing shelf space to reduce back stock. The typical store has over 300 SKUs in a back stock condition, however, with a little control we think it can be halved. Less back stock helps reduce out-of-stocks, increases labor efficiency, reduces storage requirements and increases accuracy.

Additional Product Available.pdf tags are great to help employees and customers know that product might be located in back stock or other areas of the store.