You will usually receive two payout notices and the total amount, which is the sum of the two documents, should be positive. So you will participate in the distribution even though one of the documents shows a negative payout amount.

Background: The GVL's remuneration comes from the domains "rights transfer" and "private copying and rental/lending". These two areas are reported separately due to different taxation, so you will usually receive two payout notifications. However, your remuneration will be transferred in one sum.