That's what I thought too. I don't know if perhaps that item was changed from 'On Every Transaction' to 'On Release Only' and back during the production process and that caused it to lose the serial number, but I definitely have an item in Warehosue 1 without a serial number I can't issue and a serial number sitting without an item in Warehouse 6. I'm not sure how to rectify this problem..
-Jeff
PS. It's SAP B1 8.82 PL 10