ODS in multiprovider: Can not create aggregation level

Hi Gurus,

we have a multiprovider which consists of several infocubes (standard and realtime) and a standard ODS. Our problem is that we can not create an aggregation level on this multiprovider. We get an error "infoprovider can not be used for definition". Is the problem that the ODS is not transactional or do we need to setup something else regarding the ODS. If we delete the ODS from the multiprovider, everything goes OK.

Thanks for any advice.

Jan