Master data issue

Hi

I would like to know i had extracted standard data source say 2lis_03_bx data source and in bw replicated created flow dso and cube and now i would like to know 0material object will be there in dso as key fields and we had done direct mapping form r3 fields to dso objects but i am having 0material infoprovider say as infoobject with master data with attribute and text data sources and i am having some navigational attributes for 0material and i had done check box and i would like to know now 0material will extract data from r3 field or from master data please give me in detail so that it could be very much helpful for me.