Problem with ADO in multiuser datarecord locking


My app uses ADO (microsoft ole db provider for oracle) to connect
to a Oracle 7.3 Database. The locking of records being edited
doesn't seem to work.

Although I use Server-side cursor, pessimistic locking and
dynamic cursor, user B can edit the recordset that user A is

My last project was with Oracle 8.0 and there the record locking
did work as I expected it. I tried with Delhpi and Borland C++
Builder 5, but it didn't worked with Oracle 7.3

Does anyone have experience with ADO and Oracle 7?
Any Option I forgot to set ?

Thanks in advance

Ralph Herzog
Software Engineer
Sonik GmbH, Laudenbach