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The basic explanation is that my original assumption was wrong - there are not just 2 states for a Boolean field of TRUE or FALSE, a third state of NULL is possible unless the field is made mandatory.

The basic explanation is that my original assumption was wrong - there are not just 2 states for a Boolean field of TRUE or FALSE, a third state of NULL is possible unless the field is made mandatory.

This does not answer my other problem of how to stop it happening after the fields have already been defined.