If you are changing the serial flag for an item from N to Y, the system will allow the change unless the item is a nonstock item (you may not serialize nonstock items) or unless any of the following inventory transaction types have been processed for the item (in any of the inventory locations in which the item exists).
OI, DI, DS, OS, IN, SH, VS, VP – If any Invoices, Shippers or Vendor Shipments (direct or thru pending) have been processed for the item, the system will block you from making the change to the serial flag as the invoices for the item do not have serial numbers associated with them. This logic also covers transactions that are processed from the pending file - if the item has been invoiced into pending with an OS or DS transaction, you are blocked from changing the flag – this covers Pending Write offs PA) Returns to Vendors (RD), Returns to Inventory(RI), and Pending Invoices(PI). Return Authorization activity is also handled by this restriction (an RA credit or replace will generate OI transactions when the items are returned to stock or the replacement order is invoiced).
PR, IR, VS, VP – If any receiving transactions have been processed for the item, the system will block you from making the change to the serial flag. If an item has been received, and it is identified as Serialized (serial =Y), there should be serial master records for all on hand quantities in the system and these serial records will not be present if the item was received when the flag was set to N.
IA – If any inventory quantity adjustments have been processed for the item, the serial flag in the item cannot be changed.
IT – If Inventory transfers have been processed for the item, the system will block you from making the change to the serial flag. In this situation, you will not have serial records for the in stock quantities in the source or destination location.
SF,CC,WO – If any shop orders have been completed that include the item as a component or a top level part, the system will not allow you to change the serial flag. The system will also block you from changing the flag if a WO transaction has been processed for the item as this transaction can represent the item being created as a By Product Item by the Shop Floor System.