Schedule - Negative Value on Volume (Net), Volume (Net Modeled) and '0' value on Volume | Perforation(s), Volume (Gross), Volume (Gross Modeled)

Hi,

From an excavation *dgn model, I obtained negative values for some of the Volumes, Please see the image above.

Please can you help us with this issue? we don't know the reason for those negatives values or '0'

Thanks,

Karina