Errors: a key that is taken, and other refusals
What the designer says when a definition cannot be saved, and what to do.
Errors
Keys must be unique per owner: an entity, relation type or relation key within the Tenant, or within the platform at platform scope; a field key within its entity. In a tenant, a key the platform (or your account) already uses for the same kind of definition is refused too, so Explorer and expressions keep one meaning for it; choose another. If a parent would make an entity inherit from itself, it is not added (the list offers only parents that cannot); a second decision cannot be recorded for the same inherited field.
Tip Once the schema is ready, set up views and workflows on the Workflow & EntityView Designer screen, reached from Domain views.