Cancel Partial Invoice

Created A/P invoice and fully paid with four different partial payments. After payments were created , vendor reduced amount of invoice and only cashed two of the four checks reducing the original amount of the invoice down to the amount of the first two payments.  The third and fourth payments have been voided in apps but that leaves an oustanding balance. Can the remaining balance of the invoice be canceled or do I need to void all payments cancel original invoice and create new invoice for new adjusted amount?   

Thanks

Dennis