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ORA-06534:

Cannot access Serially Reusable package string
Cause: The program attempted to access a Serially Reusable package in PL/SQL called from SQL context (trigger or otherwise). Such an access is currently unsupported.
Action: Check the program logic and remove any references to Serially Reusable packages (procedure, function or variable references) which might happen in PL/SQL called from sql context (trigger or otherwise).