I am trying to delete custom entity but it cannot be deleted because it has relationship with activities that cannot be deleted manually and when I delete the custom entity I get this error message:
"EntityRelationshipRole with id 98716f1f-d6a1-ec11-9840-0022489e0b73 cannot be deleted because it is a system record and system records of this type cannot be deleted."
I think the relationship mentioned in message is the relationship generated when I check activities option on that entity.
I appreciate any ideas.