VC++/MFC CRecordset problem

hi all,
I'm developing an application in WinXP/Visual C++/MFC and accessing a PostgreSQL 8.0.1. All works fine (open the db, SELECT, ...) but the db returns an exception if I try to insert a row using CRecordset. When I add the new row calling CRecordset::Update(), Postgres returns the exception:
"Only SQL_POSITION/REFRESH is supported for PGAPI_SetPos"

The ODBC driver version is 8.00.01.01. Any idea?

thanks in advance,
Marc

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