Error using ZStoredProc with Oracle

[Zanette]

I'm using ZStoredProc in Delphi 7 with Oracle 10g.
My code is:
[syntax="delphi"] conn.StartTransaction;

Try
proc.ExecProc;
conn.Commit;
except
conn.Rollback;
end;[/syntax]

When I run ExecProc, it raise an error:
Project Project1.exe raised exception class EZSQLException with message 'Unsupported operation'.

Can anyone help me pls?

Marcelo

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