[FATAL] Relationships can only be added to the base table [default_catalog.default_database.Customer]
in script:parserError-basetable-relationship-fail.sqrl [4:1]:

FilteredCustomer := SELECT * FROM Customer;
FilteredCustomer.relationship := SELECT * FROM Customer other WHERE this.customerid = other.customerid;
^
When a table A has the same schema as the table B that it selects from, table B is called the
base table for table A.

Relationships can only be added to base tables.
