How do I look up a payment to a vendor, using limited information, without using a report?

You will want to use the VTH table to see what payments have been issued to the vendor. In addition to the vendor number, you may want to also search by the date and amount of the payment. There is a job aid available on the Central Management Unit page on the OSC Website that can guide you through steps finding a Warrant Number in CORE by clicking here.