Can LoggedInUsername be used to populate a query

[NCHASHIM]

My report has a number of parameters, the last of which is PLANNER_AUIC_LIST to be used in this portion of the query's where clause
    $X{IN, lurn2.auic, PLANNER_AUIC_LIST} 

I am trying to populate the PLANNER_AUIC_LIST collection by this query
select 
UNIT_IDENTIFICATION_CODE
FROM (SELECT *
      FROM (SELECT DISTINCT
              uic AS UNIT_IDENTIFICATION_CODE
            from owsADHOC.adhoc_planner_rpt_uic_list
            where JASPER_ACCOUNT = $P{LoggedInUsername}
            ORDER BY UIC)
            )

I verified that $P{LoggedInUsername} is returning the expected value by temporaily sticking the value in the header.  
The parameter PLANNER_AUIC_LIST is only displaying the final record returned by the query.  (I tried replacing all of the values and noticed that it only display one value--the last--no matter what is in the table.)

What am I missing?   Can LoggedInUsername not be used a a query parameter?

[NCHASHIM]

I found my problem.  The input control specified $P{LoggedInUsername} as the VALUE column.   

I changed it to UNIT_IDENTIFICATION_CODE and the parameter display now displays the values from the table.