You may rollback the supplier offset in the “supplier payment Rollback” window, then check the status of the invoice.
It should be in “Partly paid posted” status, since WHT payment has already been done. Then no need to cancel/rollback WHT payment it will be automatically cancelled, when you cancel the invoice.
If the issue is still there, you may raise a support case, so that we will be able to further investigate and check with the relevant data.
As per my opinion, if you are trying to cancel a supplier invoice (or related voucher), before that you should have rolled back/canceled all the payments/ all the matches attached to it. You may check whether there are any payments or any matches attached to this invoice (or to the related voucher).
You may rollback the supplier offset in the “supplier payment Rollback” window, then check the status of the invoice.
It should be in “Partly paid posted” status, since WHT payment has already been done. Then no need to cancel/rollback WHT payment it will be automatically cancelled, when you cancel the invoice.
If the issue is still there, you may raise a support case, so that we will be able to further investigate and check with the relevant data.
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