We have always had a contact table in Accounts Receivable. I got a request for the same sort of thing in Accounts Payable. There is a growing tendency to email Purchase Orders to vendors. Though we had a contact field in the Vendor master, the person that the P/O is directed to isn

When printing a Sales Order, the email (PDF) option now includes a popup list of all the contacts for the Customer: Press CTRL-W or right-click on the Name field: You can add, edit, delete contacts using the buttons.