I created many relationship classes for features that relate back to a polygon boundary. Before I was able to go to the attributes tab and with all the selected records and add them to the relationship. Now when I attempt to do this it just gives me a list of all the features that have a relationship class. I have two Attribute Rules running so I don't know if they interfere with the functionality of adding selected to or deleting selected from relationship? Also the GUID have stopped being populated?
Screen shot one shows the greyed out function and screenshot two is the intersection that I was able to add to the relationship before it was disabled.