I want to create relationship between two Custom Metadatas. When I'm trying to add appropriate field and save, I get message
Cannot Create Master-Detail Relationship You cannot create a new Master-Detail relationship on an existing custom object if records already exist. You must first create a Lookup relationship, populate the lookup field with data in all records, and then change the relationship type to Master-Detail.
I have no records on any Custom Metadata. How can I deal with it?