Change output type of Purchase Order

Hi All,

Is it possible to programmaticlly change(or add) the output medium in transaction me21n / me22n when a user creates a PO?

I've been able to config the system to allow the PO to either be emailed or faxed upon the user saving. There is a requirement that when the user clicks the save button through a pop up window they can either choose fax or email, and it must then either fax the PO off, or it must email it depending on what they selected.

Is this possible?

Thanks!