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dbms_xs_system.block_principal_changes(bpc IN BOOLEAN);
exec dbms_xs_system.block_principal_changes(FALSE);
BEGIN dbms_xs_system.block_principal_changes(FALSE); END;
*
ERROR at line 1:
ORA-06521: PL/SQL: Error mapping function
ORA-06512: at "SYS.DBMS_XS_SYSTEM_FFI", line 3
ORA-06512: at "SYS.DBMS_XS_SYSTEM", line 5
ORA-06512: at line 1