Active Encumbrance Amount = Always 0.01 remainint after matching the PO

Hello group,

I am on Oracle 12.1.3 and after matching 2 invoices to the PO, the PO Status will closed perfectly, but always remain 0.01$ on the Active Encumbrance Amount field. Is there a setup/tolerance that could be put somewhere, that if the PO Closure Status becomes Closed, that this Active Encumbrance Amount will be cleared by its own?

Thanks a lot

Philip