Tax Book: Copy amortized adjustments as expensed

Summary:

Can somebody explain to me what the flag Copy amortized adjustments as expensed does on the Tax book level?

So far I have searched and didn't find any direct explanation- any documentation or example would be appreciated.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):