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Does anyone know a way to have two columns in a SP2010 list that are exclusive? I need to ensure that there is only a value for ONE column, not both.
Basically I need the following structure:
Category List ->
SubCategory List (with a lookup to Category) ->
Value (with a lookup to SubCategory).
But, if there is no SubCategory, use a lookup to Category. One or the other must be used, not both.
Using either a list Event Receiver (SPItemEventReceiver) or a Custom Workflow should be able to achieve these desired semantics.
I do not believe the model itself can represent such relationships. An alternative might be to have different content types, for which only one of the columns applies (to each).
Happy coding.