Duration:Attribute has invalid format - can't fix

RLJB

When entering a Duration field, if the user enters the format incorrectly they will be presented with the error message: "Duration:Attribute has invalid format" which presents when leaving the field

After clicking "ok" on the error message window if the user tries to click back into the field (to correct the error) the error message appears again, making it impossible for the user to correct the format

juicer

I had a similar problem when I had a rule with REPORT ERROR and also was set to 'Use rule in dynamic re-calculation on forms'. Are you doing anything like that?

P.S. I don't do that anymore.