Error made in Manual Cost Adjustment - how do I recover from it?

I have a parent assets with several children assets.  I am retiring several (15+) of the children assets (but not all of them).  I was doing manual cost adjustments to reduce the cost of the parent assets by the cost of each of the child assets that I was retiring.  After doing the cost adjustment for the first couple of child assets, I made an error in the cost adjustment amount and I did not realize that I had made the error until I had done about seven more assets.  I still have about 5 more child assets to reduce the