When we compute offset we make an error (e.g., compute ACE, TFB, or excludable expenses
incorrectly) which results in the incorrect benefit amount being paid after offset.
If we discover the error within 4 years we can correct the amount payable after offset.
After 4 years we can correct the amount payable after offset only if it would be favorable
to the claimant.
However, even after 4 years, if there is a change in the amount of WC that occurred after the initial
determination, when we recompute offset using the new amount, we can compute offset
correctly (e.g., use the correct ACE, TFB, or excludable expenses) effective with
the date of the change.