PLS-00646: MAP or ORDER method must be defined in the root
of the subtype hierarchy



PLS-00646: MAP or ORDER method must be defined in the root of the subtype hierarchy..

Answer / guest

Cause: An attempt was made to define a MAP or ORDER method
in a subtype.

Action: Define the MAP or ORDER method in the root of the
subtype hierarchy. You can override MAP methods in subtypes.

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