Records in Access forms with Allow Deletions = No can be deleted with Ctrl+Minus sign (-)

[crispinflower]

Tested in Microsoft® Access® for Microsoft 365 MSO (Version 2406 Build 16.0.17726.20206) 64-bit 

A form with Allow Deletions = No the keyboard shortcut CTRL+Minus Sign (-) results in record deletion. I think this is a bug, and probably a recent one, but can't be sure. It's quite serious and has resulted in data loss plus a lot of confusion working out how this could have happened.

[#2]

Just to add I'm unable to replicate this in a really simple bound form, and will try to work out what form setting allows this to happen.

[#3]

We've discovered the cause.

The forms in our affected applications have lots of sub-forms on tabs. Where one of these is bound to the same table as the parent record, and where the sub-form has Allow Deletions = Yes, if the user positioned their cursor on the sub-form (certain controls) then uses CTRL + Minus, this results in the deletion prompt. The results of confirming this are variable - presumably depending on the exact sub-form/control data binding - sometimes it really deletes the parent record, other times it appears to do and and breaks the form (ODBC errors - linked SQL Server) but the record actually has not been deleted.
So we can fix this in our application by making sure Allow Deletions = No on the affected sub-forms.