Problems creating aggregation levels over a Multiprovider

Hi experts,

When I create a aggregation level over a multiprovider the system returns an error " Infoprovider XX cannot be used for definition". I have read other threads with the same question and its solutions. I have checked my system and all is correct. The multiprovider has linked five infoproviders, one as real time.

Any Idea?

Please, it is very urgent to solve this.

Thanks a lot in advance.