Answer / guest

Cause: The capability in question is not supported when the
materialized view's container table has a column that does
not correspond to an output expression in the select list,
and that column has a NOT NULL constraint. This situation
can result in problems during refresh since any new rows
inserted into the materialized view will set that column to
NULL.

Action: Disable or remove the NOT NULL constraint.

Please add more information about this Error

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