Fix Item Ledger Entry

Hi all,

We have some guys in the back that did some messed up things throwing off costing reports. Does anyone know of a way to fix an incorrect Item Ledger Entry that is already closed and the Mfg Order is closed also? Here is a screen shot of the problem.. for some reason they un-consumed parts at $18K then thought it would be ok to negatively adjust them out at the same cost yet the Mfg Order is now way out of wack.

Any advice on how to approach this issue?

Thanks!