Do not allow requisitions to use an inactive vendor

Please change requisition entry so a requisition cannot be approved when entering a vendor that is not active in the system. They should receive an error or be prompted to contact Finance to re-active the supplier. Also please do not allow the user to manually type in the requisition a new vendor name that does not already exist in the system. They should only be able to select a vendor that has an existing vendor file. The vendor number field should be mandatory and cannot be left blank.