Log4OM

I received an email from Clublog reporting an issue with a QSO in my logbook where I'd inadvertently logged it as 'MO0' instead of 'M0'. I've tried to edit the QSO but get a warning stating "QSO not saved. Check Band/Mode/Callsign/Date".
Why am I unable to save the corrected callsign?

What version of Log4OM are you using? there was a glitch in a previous version whereby when editing a QSO the Band/mode data field was changed/emptied so that you got that message when saving.

The fix is to finish your edits then go to the 'QSO Info' tab of the edit screen and reset the wrong band/mode then save

I'm using V2. The only item I need to edit is the callsign, all other info is correct but I can't do it.

There have been 20 plus releases of v2 which one - see help/about

I realise you only want to edit one factor but read what I wrote again

Oops... I'm using version 2.15.0.0.