December 14, 200916 yr Hello all, Trying to figure out the calculation to do the following: In my database, I have a Customer table and a ContactLineItems table. I use the ContactLineItems table to store phone number and type (Ie. Home, 555-123-0001). Additionally, I have a IsMain field that uses a checkbox: the user can mark a phone number as "Main". What I am trying to do is write a calculation that prevents a user from marking more than one number as "Main".... Any ideas?
December 15, 200916 yr Instead of marking an item as "Main", store the item's ID in a field of the parent record.
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