Cancell or revere PO commitment line items

Hello Gurus,

Here is my requirement,

I want revoke or reverse or cancel  my PO commitment line items. which partially confirmed.

like

Now i want reverse remaining commitment line items. i tried tcode: CJBN and CJEN and program RKANBU01 but no use , please suggest me how reverse and i dont want reverse my PO , but i want reverse my remaining committed line items and that amount back and sit on budget .

Thanks in advance