BIP11g - Logical query with VALUEOF(NQ_SESSION.USER)

Hi,
when i execute a logical query to view VALUEOF(NQ_SESSION.USER), always BISYSTEMUSER returned.

I connect with other user.

An example:

SELECT

   0 s_0,

   "Test"."- Testa Data"."Cod. Data" s_1,

      VALUEOF(NQ_SESSION.USER) s_3

FROM "Test"

The result is:

!--Generated by Oracle BI Publisher 11.1.1.6.9--><DATA_DS><G_1><S_0>0</S_0><S_1>#</S_1><S_3>BISystemUser</S_3></G_1><G_1><S_0>0</S_0><S_1>01EB</S_1><S_3>BISystemUser</S_3></G_1><G_1><S_0>0</S_0><S_1>01ES</S_1><S_3>BISystemUser</S_3></G_1><G_1><S_0>0</S_0><S_1>023M</S_1><S_3>BISystemUser</S_3></G_1><G_1><S_0>0</S_0><S_1>0CAB</S_1><S_3>BISystemUser</S_3></G_1></DATA_DS>