Error when removing Indexed Column from List September 26, 2014 by davecavins with no comment General SharePoint So you are trying to remove indexing from a lookup column in a SharePoint list and you get an error like this: Very helpful error message The problem is that the column has relationship behaviors turned on. Go to the list settings and turn it off. Enjoy the rest of your day. Relationship Behavior Previous Post SharePoint List Driven News Ticker Next Post SPServices Retreiving and Filtering Data