Internal Order Settling Problem

Good aftnernoon,

We are facing a problem concerning Internal Order Settlements.

In KOB1, the Investment Order has an actual cost of over 1 million in our own currency, splitted in different Cost Classes.

After the settlement in KO88, instead of becoming zero, the value turns to 810 thousand negative.

The settlement is selecting costs that were already zero and turning it negative. I can't find where are these values coming from or why is the settlement leaving a negative value instead of zero.

Any ideas why?

Thank you