Unable to get the Employee Key value in BICS connection Filter

Dear BI experts,

I have created a Webi report by BICS connection directly from a BEx Query. I have the Dimension "0EMPLOYEE" in the BEx query. In the Webi report, I have the Employee as the filter value in the Webi query. I see only Text value of the employee appearing in the drop down values. The customer wants to see the Employee key like the employee number instead of employee name in the filter value.

I am unable to do it. I try to change the Display to "Key" in the BEx query. But still unable to see the expected result in the webi query filter.

Could someone help.

Thanks,

Sai