ORA-06573: Function string modifies package state, cannot be used here

Cause: There are two possible causes for this message:
 * A SQL statement references a packaged, PL/SQL function that does not contain a pragma containing the ‘Write no Package State’ (WNPS).

* A SQL statement references a stand-alone, PL/SQL function that modifies a package state. A stand-alone, PL/SQL function referenced by a SQL statement cannot modify a package state.

Action: If the function is a packaged, PL/SQL function: Recreate the function and include a pragma containing the ‘Write no Package State’ (WNPS). If the function is a stand-alone, PL/SQL function: Delete the function from the SQL statement.

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