Problem: You are working on a site under development and want to have uppercased translations of custom post type slugs using WPML. However, when you enter an uppercased slug, it saves all as lowercase. Solution: Unfortunately, it is not possible to save uppercase slugs due to a restriction from the WordPress core. WordPress only allows lowercase letters in slugs. You can read more about this restriction on this link.
If this solution does not apply to your case, or if it seems outdated, we recommend opening a new support ticket. We also highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins.
