Serial number & cannot be used in inspection lot &

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Use the possible entries function to call up a list of all valid
serial numbers for the inspection lot.
If the desired serial number does not appear in this list, you can
change the serial number.
To do this, call up the function for the serial number in the
<LS>Edit</> menu.

Error message extract from SAP system. Copyright SAP SE.