I want to lock a value in a ForeignKey field in a record once two other
fields are non-blank.
The record can be saved with changes to that ForeignKey field provided
one of the other two fields is blank.
Other fields in the record can be changed or the record deleted and
reinserted but it will be a business rule violation to change that
ForeignKey.
I thought of adding a duplicate field and if both of the other fields
are non-blank comparing the duplicate with the ForeignKey field to see
if a violation has occurred. Seems messy.
How can I do this?
Thanks
Mike
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