Are you new to BI there is no Dso with that name .
I think you have seen some where that dso name i.e used for naming convention.
search in help.sap.com with data source name will provide all details.
2lis_02_hdr help.sap.com
http://help.sap.com/saphelp_sm32/helpdata/en/1d/f4383fdb800804e10000000a114084/frameset.htm