Performing Layered Cost Adjustment_Not adjusting to $0

Summary:

We have been performing layered cost adjustments for specific items that are leaving an extremely small balance of cost open. When performing the cost adjustment we are setting the cost to $0, but after the adjustment is complete there is a small remaining cost open. As you can see on the below cost adjustment we have set the cost to $0 and it shows the percent change is -100%.

As you can see after the layer cost was completed, there still shows a ledger amount of $1.48 with a unit cost of 0.001. We are trying to understand why there is still a balance in the GL after the layered cost adjustment was completed.