Random field values empty in SSRS

Hi, I have a SP which executes fine in SSMS and showing all the rows, But when i create a report using that SP random field values are empty.Sample ScenarioSSMSSNo Last Modify Time 1 2013-09-06 01:41:35.837 2 2013-09-06 01:42:25.300 3 2013-09-06 01:43:06.693 4 2013-09-06 01:44:48.583 REPORTSNo Last Modify Time 1 2013-09-06 01:41:35.837 2 (Empty) 3 (Empty) 4 2013-09-06 01:44:48.583Any suggestions would be appreciated.