Control Plans - Serialised items

Good Morning,

We currently use Control Plans for any non-serialised items (Categorical) set as a basic pass or fail within the category ID which works fine.  We would like to expand this out to our serialised products using the same pass/fail controls but during our testing the analysis is requesting us to add in the serial number, but the list of values is empty.  Any attempts to enter any information in the Serial No field is met with errors which we expected as the system can’t see anything to cross-reference against in the list of values.

Would anyone know what steps we are missing please ?

Any help would be gratefully appreciated.

Thankyou in advance