I have a Domain Model that has 4 "has Many" relationships with 4 different join models (Character, Clan, Covenant, Coterie). When creating a new record, the user is presented with 4 option boxes, each filled with different data pertaining to the 4 associated models but defaulting to an empty option. The Rule I want to create will require one field to contain selected data, but the other 3 to be empty. If the user selected two or more options, I want to have an error displayed on the option boxes that the user selected. Any ideas? Thanks.
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