Are you recording this info in a "notes" line on your tester? I used to do this then changed the fields to make, model, serial no. and now I make any detailed notes about assets outside of the tester. However, you can see what 'notes you have made by selecting the item, then press the 'test results' button then 'details' button and the notes appear in the comments box.
As you say these comments are only displayed in a PAT test certificate report.