ORA-06571: Function string does not guarantee not to update database

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ORA-06571: Function string doesnot guarantee not to update database
Cause: There are two possible causes for this message:
* A SQL statement references a packaged, PL/SQL function that does not containa
pragma that prevents the database from being updated.
* A SQL statement references a stand-alone, PL/SQL function that contains an
instruction to update the database.
Action: Ifthe referenced function is a packaged, PL/SQL function: Recreate the
PL/SQL function with the required pragma; be certain to include the 'Write No
Database State' (WNDS) argument in the argument list of the pragma. If the
referenced function is a stand-alone, PL/SQL function: Do not use the function.