Oracle : Ошибка ORA-23477

"unable to alter propagation mode for object group \"%s\".\"%s\""
*Cause: The propagation method of a materialized view object group can only
be altered when no other object groups with the same master object
group are sharing the materialized view site.
*Action: Ensure that there are no other materialized view object groups at
the local site with the same master object group.

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