ORA-24406: API mode switch is disallowed when a call is in
progress.



ORA-24406: API mode switch is disallowed when a call is in progress...

Answer / guest

Cause: A mode switch from OCI8 to OCI7 was attempted in a
callback.

Action: The user should perform the API mode switch either
prior to initiating the top call or after the main call is done.

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