Cause: At least one voucher was not voided because:

a) The voucher is partially paid, or

b) The voucher is not posted.

Resolution: Void all the payments associated with the voucher, if the voucher is partially paid.
Void the voucher through P0411 application.

Non posted vouchers are voided through application P0411.
If you want to void the voucher through the payment void process, the voucher has to be posted previously.