It would be most beneficial to have the Purchasing Vendor Cost on the Short-Buy Screen instead of the "Wholesale Cost". The Contract/Wholesale Vendor Cost that is Asterisked on the Vendor Screen should be the Cost & record you see. It is the cost you're paying for that product. The Wholesale cost means nothing if you have other pricing.
Here is how I get around that -
Go to +E-A, (or Keyop Menu, Specials, E-A). If you select 5 (Update Wholesale Cost), and base it on A (Purchasing Cost), then it should resolve your problem.