Case attribute : prevent checking in more than one record

Hi,

I can limit the number of record displayed in FE but can I limit in BE the number of records where a checkbox is checked ?

I would like to secure a checkbox in inputscreen for it can only be checked in one record in a MM. So user can't check it without having unchecked former one (with a message which displays to prevent).

Or, best case, a message displays to prevents and proposes to automatically uncheck former one if ok. But it would be bonus ;-))

https://github.com/MetaModels/core/issues/764