A vendor doesn't have a card
To enter a purchase, you must begin by choosing a vendor card. If you're entering a purchase for a new vendor who doesn't have a card yet, you can quickly create one using MYOB AccountEdge's Easy-Add feature. Follow the steps in To enter information about a new vendor (using Easy-Add). Easy-Add enables you to create a card with only the vendor's name and the standard default information that is provided for new vendors. You can use the Card Information window to add contact information and make other changes later on if you like. (Adding cards)
If you frequently make purchases from one-time vendors and you don't wish to track information for each of these vendors individually, consider creating a vendor card called "One-Time Vendor." That way, you'll be able to enter purchases from these vendors more quickly and you'll be able to view purchases information for them as a group.