ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY, etc. C...

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ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY,
etc.
Cause: An attempt was made to select FOR UPDATE from a view which had not
been merged because the view used syntax (for example, DISTINCT or GROUP
BY) preventing the merge, or because of initialization file parameter settings.
Action: Determine the reason the view will not merge and, if possible, make
changes so that it can.