ORA-28580: recursive external procedures are not supported

oracle

ORA-28580: recursive external procedures are not supported
Cause: A callback from within a user's 3GL routine resulted in the invocation of another external procedure
Action: Make sure that the SQL code executed in a callback does not directly call another external procedure, or indirectly results in another external procedure, such as triggers calling external procedures, PL/SQL procedures calling external procedures, etc

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