Using a BeforeUpdate to stop an AfterUpdate

[snipe]

Hey guys,



I think I am just having a blonde moment or something.

My BeforeUpdate on an option group checks to see if a date for the record on a selection form matches a date on the main switchboard. If it does, I want a message to pop up and and for the option group to not be changed from the default value. The after update for that option group fires off some code that changes a few values for that record.

How would I do this?

[NTC]

BeforeUpdate you need a compare, if valid, then a message box, change value to default, and lock the control

not sure the AfterUpdate is at all relevant per se......not sure if it even fires....