What are the options to close a voucher tied to an adjustment voucher that is paid?

Hi - We have a couple of credit vouchers that we need to close.  They were initially paid in 2015 along with 3 other vouchers, but the payment was voided and the vouchers were put on hold.  Two adjustment vouchers were entered, with debit amounts, and were subsequently paid.  The two credit vouchers remained on hold.  Now, it's been determined that the two credit vouchers need to be closed.  However, when trying to close, we receive the message that the voucher is tied to an adjustment voucher and the adjustment voucher must be closed first.  But, we do not need