Remove Project Association

  Our users have created 2 Contract documents and associated these documents to the same Project.  Now they have notified us that 1 of these Contract documents was created in error and they would like to remove the association from the Project.  However, it appears that we can no longer update this field in the Contract Header of the Contract Authoring Workbench.  Is it possible to remove this association?

In a test instance, I was able to create 2 Contract documents, associate them to the same Project, and then remove that Project association from 1 of the Contract documents, however, I am not able to do this for the user’s example.