Purchase order workflow customization

Summary

Purchase order workflow customization

Content

Hi,

I want to customize the purchase order workflow so the mail message to the supplier will include additional attachments as follows:

1) Buyer create Purchase order with Item # A.  Item # A have few attachments in the master item page ( see attached file )

2) Buyer submit the Purchase order for approval

3) Upon Purchase order approval, the customization will automatically attach the files from step # 1 to the supplier mail message.

Any ideas how to acheive that ?

Thanks Shlomo