Custom Rewrite Slug – problem

I’ve tried to set Custom Rewrite Slug to other, then resaved permalinks too, but still doesnt work..
the only way to change the custom post-type base “Custom Rewrite Slug”, is to change the “Custom Post Type Name” (the first top field) only.

So, i think there might be an issue.

(to say example, if i want to have a cpt with name “entry”, but set “Custom Rewrite Slug” to “entries”, the post still publishes with:

example.com/entry/post-name
instead of
example.com/entries/post-name