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ApplauseguyApplauseguy 

Validation Rule Assistance Needed

I have a custom object that contains Role information for contacts.  Each contact may have several role records.  I would like to use a Validation rule or Workflow rule to check when a value is being added to a contact that the same value has not already been assigned to that contact.  The role values are controlled by a picklist, and the object has a master relationship to Contact.  Any assistance would be appreciated.