Oracle Error Message
ORA-06534: Cannot access Serially Reusable package string
Reason for the Error
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.
Solution
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).