Condition, Result Row not calculate data as desired

Hi Experts,

here I have encounter a problem that, after setting condition, the result row do not change.

For Customer report for example.

Customer, O/S

C1, 100

C2, 200

C3, 50

C4, 300

-

result 650

with condition O/S>=200

then:

Customer, O/S

C2,200

C4,300

-

result 650

According to help.sap.com, it says the condition only hide the records that do not fulfill the criteria, the result row will remains unchage.

Do we have any method to get 500 as the result (200+300) instead of 650?

thanks a lot.

Kenny