select distinct values for ssrs sharepoint parameter

hi,

I need distinct selected values for parameter dropdown in shaepoint ssrs. Everrything will work fine if i select value and label field same field like(Location_Code). But i need value field to be different field (LocationID). like (dropdown id in value field and text as lable field)

Because i am using value field in record filtering.

Any suggestions?

Thanks Manohara R