Your buyers have way too many things on their plate, and they want to email suppliers for an RFQ
Some parts need to be purchased through an RFQ. And some through a catalog system.
All PO's should be approved by someone, but your ERP system doesn't handle it natively
An item is triggered for purchase (either based on an ERP transaction, or on a daily schedule)
The system identifies the supplier(s) that should receive a quote based on past purchase history and current supplier status
An email is then sent to the supplier from the buyer's email address, requesting a quote