Backoffice navigation

filip.gojkovic955

https://docs.spryker.com/docs/scos/dev/back-end-development/zed/add-navigation-in-the-back-office.html#define-a-navigation-merge-strategy
Documentation states:
"Using BREADCRUMB_MERGE_STRATEGY, the first two levels of project-level navigation elements replace the core-level ones. All the project-level navigation elements below level two are appended to the core-level navigation elements. Use this strategy to avoid duplication of the navigation elements that can have different parent elements in core and project-level navigations."

No matter what i do I can not get core navigation elements to appear when using BREADCRUMB_MERGE_STRATEGY. Only items stated in global configuration file (config/Zed/navigation.xml.) are visible.
How does my xml file need to look like to take have some navigation elements from core?