User Activation Issue

Hi,

I  have proceeded with the user management with User- self service.

Scenario: Currently on Post operation for UserRequestCollection is success as below:

I checked the SOST Tcode as below:

also Get one pop-up saying eXpress document...

ISSUE:

Now if i proceed for User Activation as following, I face error:

When I debugged found that, I get Error as the BAPI return nothing >>   BAPI_USER_GETLIST and later its passed to BAPI_USER_GET_DETAIL. .

Have I missed some necessary step or something byfar..?

Thanks

--Pavan G