ORA-01732: data manipulation operation not legal on this view

I got ” ORA-01732: data manipulation operation not legal on this view ”  error in Oracle database.

ORA-01732: data manipulation operation not legal on this view

Details of error are as follows.

ORA-01732: data manipulation operation not legal on this view

Cause: An attempt was made to use an UPDATE, INSERT, or DELETE statement on a view that 
contains expressions or functions or was derived from more than one table. 
If a join operation was used to create the view or the view contains virtual columns
 derived from functions or expressions, then the view may only be queried.

Action: UPDATE, INSERT, or DELETE rows in the base tables instead and restrict the operations
 on the view to queries.

data manipulation operation not legal on this view

This ORA-01732 errors are related with the attempt was made to use an UPDATE, INSERT, or DELETE statement on a view that contains expressions or functions or was derived from more than one table.

If a join operation was used to create the view or the view contains virtual columns derived from functions or expressions, then the view may only be queried.

UPDATE, INSERT, or DELETE rows in the base tables instead and restrict the operations on the view to queries.

To solve this error, Set the _simple_view_merging to TRUE and execute SQL statement again.

ALTER SESSION SET "_simple_view_merging"=TRUE scope=both

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