BW query as datasource for segmentation

Hi,

At help.sap.com the following is posted:

"Only use queries that are based on InfoCubes. Queries that are based on ODS objects and BI InfoSets are only partially supported." (http://help.sap.com/saphelp_crm50/helpdata/en/af/d0efa709f811d4b2d70050da3ee986/frameset.htm)

Does anyone of you know what partially means in this case? When is it supported and when not??

Thanks, Camilla