Two CPT: one is using part of the custom rewrite slug from the other

Question

I've these two CPT: Publications and Books.

The custom rewrite slug for Publicationsare just /publications/
I want the Books CPTs rewrite slug to be /publications/books/

But I do that and I get an 404 error when navigating to site.com/publications/books/wordpress-is-great

Most certainly be cause it is the publications rewrite rules which "step" in and not books but I can't seem to figure out how to make this work and "combining" parts of the rewrite slug for Publications.

Answer 1

The URL reads as if books is a sub taxonomy of publications.

Try using 'publications-books'

Don't forget to re-save the permalinks in the settings -> permalinks options.