RE: One time vendor payment
This is one way I have seen it done:
Go to Accounts Payable > All Vendors, create new vendor name it "One-time Vendor".
Once set up you can double click that vendor and under Addresses you can create a new Address for each vendor you need. Just ensure that you also edit their "Purpose" to "Remit-to"
Once vendor is created, and you create an address for the vendor you are purchasing from you can start posting invoices to them.
To post an invoice to the one time vendor go to Accounts Payable > Journals > Invoice Journal, create new and click Lines, once in the Vendor Invoice form select the new "One time vendor" and then click on the tab "Remittance" and change the remittance address to the one you created under the Vendor. This step is VERY important and needs to be done for every one-time vendor used especially if you print cheques using remittance address.
Then when you go to pay this invoice AX won't let you pay it unless you change the remittance address to the correct vendor you created the invoice under.
I hope this helps,
JordanH