It's not possible to set default Location for objectrelationlist content field type.
Steps to reproduce:
1. Login as admin
2. Go to Admin -> Content Type
3. Select "Content"
4. Start creating new Content Type
5. Enter Identifier ("TestIdentifier")
6. Add new field: "Content relations (multiple)
7. Expand the field settings and click "Select location"
UDW is opened.
UDW does not open. Following error is visible in console: