Going back to the group example.
I would want to force the user to only insert one customer in a certain group once.
The way it was explained in the lesson, Rick, for example, can be putted to times in Harware. Is there a way to eliminate from the options the ones that are already selected for that particular user?

Thanks,

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Reply from Richard Rost:

You would have to perform a DLOOKUP to see if he's already in that group and then disallow it in the BeforeUpdate event.