Vouchers assigned the Payee's Pay Instrument rather than Vendor

When a voucher is created in A/P using a vendor with a different Payee assigned to the voucher, the voucher is assigned the pay instrument from the vendor rather than the payee.  How do we get it so the pay instrument assigned the voucher uses the payee's payment instrument type (as set up in the supplier master) instead of using the vendor's ?  thanks for your help with this.