Unable to assign an LDAP group to a business role


Unlike what is specified in the link below ....


... I am unable both to ...

- Assign a business role to an LDAP Group. After having selected an LDAP group, the menu "Assign business role" display nothing
- Assign an LDAP Group to a business role. When selecting a business role, there is no menu "Assign LDAP group". And yet, I have menus to assign SAP roles and AD groups.

What could be the reason ?

Many thanks.