Purchase Order: Mass modifications

Hello:

I'm using transaction MEMASSPO to change "delivery date" in purchase orders but I can't. OSS note 443777 says it is possible to do that since:

"... Transaction MEMASSPO can only change fields which are contained in the standard system of program SAPMM06E on the following screens:

0101 header data purchase order

0111 order item data purchase order

0120 purchase order item overview

and which can there be changed in transaction ME22

..."

and "delivery date" in in screen 0120.

Can anyone help me, please?

Thanks,

Abel Grandal