This article provides resolutions to some application errors.
I am trying to remove a part type.
I have confirmed using the Statistics report that there are no parts of the type, yet I still cannot remove it from the meta model.
The following items could not be deleted
It may be that it is being used in an Add Part Grid configuration. Investigate and find which Add Part Grid config item contains the reference. The reference must be removed before you can remove the part type.