On the Produmex > Cycle count menu there is an option to list and remove missing serial numbers.

Type
Displays the filtering conditions for the items in the list. Select the serial number type on the combo box. The following items can be listed:

• items managed by PMX serial number with track location, but the linked LUID is no longer in stock
• items managed by SAP serial number with track location, but the linked LUID is no longer in stock
• items managed by PMX serial number without track location, but the batch is not in stock

Item
Filter the list by selecting an item. Only items having PMX serial numbers or SAP serial numbers with track location can be selected.

To remove serial numbers, select their line and click on the ‘Remove’ button.