
If all the conditions below are met, and the problem is not yet resolved, you can consider opening a problem ticket for us to look at in more detail:
You have read the document on OBN, specifically chapter 5.11 Object-Based Navigation (OBN).
You have read all OBN.* related texts in the FAQ.
You have checked table AGR_HIER_BOR to confirm that this OBN target is actually defined in a specific role.
You have used transaction SU01 to confirm that this role is assigned to this user.