Hi Santhosh ,
There can be chance of getting no data error when drill down with characteristics (If SID 's are not properly configured to data) .
Specify some data authorization to user/Filter query with specific country which gives less records .Then drill down with all characteristics in RSRT and check .
There can't be any issue at BO end regarding MDDatacell error , this I'm sure .Webi can easily get 2L records.
Check any Safety belt applied in BW .