The status of a serial number is PIAC (Physical Inventory Active) but the Physical Inventory Process has already been finished. The status of the serial number needs to be fixed.
First double check that there is not any active Physical Inventory Document in MI22 for the data you are trying to move. If there is any active document, post the differences for it in MI07.
If the status PIAC remains after posting the differences, then, check the report ZREPSTAT of the Note 369501.
Read all the details in the note before you run this report.
Related notes / content:
369501 Serial number status 'PIAC' is not correct