how to adjust group by clause in query

Hi how to prevent query manager from automatically adding the expression - (SUM(  SUM( A.POSTED_TOTAL_AMT))-SUM(  SUM( B.BUDGET_AMOUNT)))"VARIANCE" to the group by clause SELECT (SUM(  SUM( A.POSTED_TOTAL_AMT))-SUM(  SUM( B.BUDGET_AMOUNT)))"VARIANCE", A.DEPTID, B.DEPTID, SUM(POSTED_TOTAL_AMT), SUM( B.BUDGET_AMOUNT)   FROM PS_NJ_ACT_EXP_A_VW A, PS_NJ_D_BUD_EXP_VW B   WHERE ( A.FISCAL_YEAR = :1      AND A.ACCOUNTING_PERIOD <= :2      AND A.DEPTID = B.DEPTID      AND B.FISCAL_YEAR = :1      AND B.ACCOUNTING_PERIOD <= :2      AND A.FISCAL_YEAR = B.FISCAL_YEAR      AND A.ACCOUNTING_PERIOD = B.ACCOUNTING_PERIOD)