Q+E odbc/ms access/Informix db transactions logging

Hi, When we wanted to update records in informix database tables attached to MS Access database using Q+E ODBC drivers, we got an error, "Not in transaction". After speaking to Q+E they said you have to have transaction logging ON if you want to use Q+E to perform update operations. Is is true? Does anyone encountered this issue before? We use Informix SE on Unix. Another sad thing about MS Access is, you have to have a unique index present on a table in order to update records. That unique index must have only one column as a part of the key. This makes only 25-30% of our tables eligible for update through this mechanism. Sadru Fidai