I would like to generate purchase "receipts vouchers" using an email alias, like is available for the Expenes Module.  I have installed the "Sale and Purchases Voucher" module for odoo 10 and created an alias that is "receipt@example.com" and uses model "Accounting Voucher" but it does not distinguish between a purchase voucher or sales voucher and does not generate any action when the email alias is received.  I want this functionality because unlike the expenses module functionality, I need to be able to enter multiple expense accounts per receipt where an expense entry is only one expense account/entry per document.  I still would like to be able to import/attach an image to the voucher like is available in the expenses module.