Deleting Provisioning plugin causes fatal error

Assuming we create a Provisioner plugin with a has many relationship with other related Models. Then we configure the plugin in COmanage Provisioning Targets and continuously we try to Delete it. The result will be fatal error.
The reason for this is the existence of a swallow copy of the plugin's object in the ClassRegistry instance. This copy contains the plugin object but does not contain the relationships. In order to make this right we should remove the object and recreate it.