Regarding linerow order

Hi,All

There is a problem as follow.

I add a new PO .For example

itemcode qty

1001 10

1002 20

1003 30

1004 100

I hope it show as follow by DI API

itemcode qty

1003 10

1001 20

1002 30

1004 100

In a word ,arrcording to my requirement to order row list.

Everybody can help me ? I appreciate you in advace.