Why does a useful life change that is amortized in Corp book not give warning in periodic mass copy?

When we make a useful life change in the Corp book and don't amortize, we get a warning that this won't go over to the Tax book when we run periodic mass copy. But, when we make a useful change in the Corp book and amortize, we don't get a warning when running periodic mass copy and it shows a transaction on the Tax book just for the amortization, but no useful life change goes over. Shouldn't we get a warning that the useful life change can't go over to the Tax book?