If we receive a check from a vendor refunding us for a bill we paid twice, how do we record that? Previously we would void the payment, using the void button directly the payment screen. Then the deposit would be made on the AR side, with the vendor name in the Name field. This doesn't seem to be the ideal solution, and all we are seeing on NetSuite's site is to create a Bill Credit and then apply that to the deposit. That doesn't make sense from an accounting standpoint either.

it seems you had two bills entered and you paid two bills, no? what exactly caused this payment two times for the same VB? Understanding it likely will help the counteraction

if you paid an bill twice then you have a payment ( journal entry ?) not applied to an bill. It will therefore be necessary to apply the reimbursement to this payment