I printed an income statement this morning and noticed the inventory account had a huge negative balance. 

On further inspection, it comes from Inventory Adjustment Transaction

1520 Inventory A      2957040

5020      Inventory A Cost    2957040

The transaction this refers to is an $8k transaction so I am trying to figure out why it is there, as all the other inventory transactions are the same amounts. 

Do I just do a journal entry to reverse it?

Thanks