Solution : https://service.sap.com/sap/support/notes/1147651 (SAP Service marketplace login required)
Key words : 
actvt fieldplease add objects, enterprise role management reason, enterprise role management, enterprise role management 5, error message displayed, abap back-end, terms role expert, missing security authorizations, role expert 5, missing authorizations
Related Notes : 
       
| 1548963 | Role is not generated in ERM | 
| 1502953 | Function Module not found | 
| 1485227 | Error in generating roles with Area Menus |