BT, if all the columns of a AC entry are filled no look up in the central Database will be proceeded.
As far as I know there are two ways to force a auto re-population:
1st. Delete the complete record from the Database. Next time the AC's HEX address will be received the new -and then hopefully correct- Data will be added to your Navdatabase. The existing pictures of the B727 shall be overwritten.
2nd. Go to your picture folder and delete the pictures D-ABKI.bmp and if present D-ABKI,2.bmp. On next time the AC is received, the Software will look for the missing pictures and will detect the new AC Data and shall update your Database.
As far as I know a recurring check whether the AC Data is still correct or not, is unfortunately not part of the software at present time.