Triggering approval with attach files on Material Reservation MB21

Hi Experts,

We have a requirement that needs to trigger approval with attach files when save material reservation MB21. Actually User wants to attach a desktop item (word, excel or text file) and item from Outlook inbox/outbox can be attached to the reservation.Once we save the reservation, the approval email gets triggered to the approver along with those attach files to his SAP inbox. So i believe, we have to do below two things.

1. Need to do settings/customizing that allow to add multiple attach files while creating material reservation since SAP standard doesnt have option to attach file in MB21.

2. Need to include the attach file coding part into the existing process as it is already routed to appropriate approvers.

So existing process is, while save material reservation, the notification is triggering to respective approver correctly. Now the addtional requirement is to include attach files while triggering approval. if anyone already experienced on this case, Pls give some ideas that how can we do settings/customizing that allow us to attach file in MB21 And also kindly provide some coding part support towards the inclusion of attach file concept?. It would be very immensly helpful in order to achieve this requirement. Many thanks in advance.

Regards,

Kavi