PO Print Output using Services for Object

Hi,

I am trying to create a quick print output for PO from ME22N and ME23N using the services for object. The purchasing support and expeditors need to print these PO a lot. And they are looking for a quick way to do it. rather than having to go into Messages.

Please tell me how I can create the existing PO to be attached in the attachment list in the services for object.

Thanks,

~Syed