That could never happen.  Voids occur when the transaction has not been settled with the merchant, and thus the charge would show up as a pending transaction on the registrant's CC statement.  Voids are all or nothing.  There aren't any partial voids.  Once the transaction settles, voids are no longer possible, but refunds are.  Refunds can be for any amount up to the original amount charged.  Thus, a combinations of voids and refunds is not possible.