How to control the "round value" for the subitem in SD condition?

Hi,

As you all know, we can control the 'round rule' for each condition type to Commercial, Round up,or Round down by the customizing.

But to the "subitem" in the condition Tab of sales order, how to control its round rule?

For examples:

I can get the following kinds of contents

in the Condition Tab of a sales order as follows:

PR00 Price: 7.22

-

Gross Value: 7.22

Discount Amount:0.00

Rebate Basis:7.22

Net Value for Item:7.22

Net Value 2:7.22

Net Value 3:7.22

I can control the 'round rule' for the condition type PR00 in the customizing of condition type, but how to control the round rule for the Gross value, discount amount, Rebate basis, Net value for Item, Net value 2, & Net value 3....

Thanks.