Data Save Error Message - Seeking Record ID

Good afternoon everyone!

Noob here with hopefully an easy question. I searched online and on the forum, but couldn't find anything for this.

When one of our users tries to save a log file they are working on with gINT Professional, they get an error message that reads the following:

DATA SAVE ERROR. Unable to locate record for update. Seeking record ID '139'. [OK] Keep the grid as shown, [Cancel] Reload from the original records.

This issue is only with one file, as they don't have issues saving other files. Could someone enlighten me on what this error message means and what is "Record ID 139".

Thank you!!

Sergio