Passing Multiple values to a report

Hi,

        I have a report with 5 parameters and 4 sub reports. Among them for 1 parameter users want to give a list of comma separated values. So, I wrote a formula

(Split({parameter}[1],",") = database field) in the main report. My issue here is if I give 3 comma separated values, I am getting data, but it is repeated thrice.

I haven't changed anything in the sub reports.  The sub report also has same parameters as the main report but "database field"from the above formula doesn't exist in the sub report.

Please, provide me a solution,

Thanks

Sandy!!