Com Interop Stops on Warning Messages

Hi List!
I am writing a Com interoperability program to 8.10. Login and Bsfn run works fine but when the business functions return a warning my program throws an error. If I ignore the error the program can't execute the next BSFN.
My InteropDebug ends like:

Tue May 02 16:15:29 2006 3964 [PSFT] Leaving retrieveAlphaDescriptionAndGlossaryText
Tue May 02 16:15:29 2006 3964 [PSFT] BSFN ERROR: Unknown exception caught.
Failed to execute business function.

So my guess is that the retrieval of error message text goes wrong somehow...

Any Idea?

Thanks:
Gergely Pongrácz
e-Best, Hungary

Current System is: 8.10 on Windows/MS-SQL

Do you never see the next error on InteropDebug.log?
Failed to get OCM info for GetEffectiveAddress business function.
How do you configure OCM?