ORA-40610
Cannot create JSON Relational Duality View 'string': All joining columns of table 'string' must have a foreign key constraint to table 'string'.
Cause
A table joined with another did not have foreign key constraint on (all) the joining columns, which is required to uniquely identify the Duality View objects.
Action
Define foreign key constraint on the joining columns of the specified table to the primary or unique key of the other.