ORA-30372: fine grain access policy conflicts

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ORA-30372: fine grain access policy conflicts with materialized view
Cause: A fine grain accesscontrol procedure has applied a non-null policy to the
query for the materialized view.
Action: In order for thematerialized view to work correctly, any fine grain access
control procedure in effect for the query must return a null policy when the
materialized view is being created or refreshed. This may be done by ensuringthat
the usernames for the creator, owner, and invoker of refresh procedures for the
materialized view all receive a null policy by the user-written fine grainaccess
control procedures.