How to remove Parent from a Class (Project) record
We have several Class (Project) records that list themselves as the Parent Project. (Essentially a hierarchy of "Project1 : Project1".) I would like to change these just to be top-level projects, but when I edit the record and specify a blank Project Parent, I get an error saying that "This record already exists". But there is NOT any record with a top-level project.
How can I remove the parent of a Project record to make it a top-level project?