negative units in itunes connect sales report

Question

Today I found a -1 in the units column "units" and in the same line a negative full app price next to the normal positive proceeds in the daily sales report in ITC.

Looking around on Google gives no real explanation. (from returned app to Apple correcting sales report numbers)

Anybody knows what this really is?

Many thanks

Answer 1

-1 means that somebody (1 person) requested and achieved a refund on your app.