Solution : https://service.sap.com/sap/support/notes/859104 (SAP Service marketplace login required)
Key words : 
general information aboutexternal programs, btcoption = extprog_authcheck    value1    = onif, system administrator authorization schedules, system administrator authorization, havesystem administrator authorization, authorization object s_rzl_adm, terms s_rzl_adm reason, future users call, longer occur due, basis support packages
Related Notes : 
       
| 854060 | Authorizations for external commands | 
| 677435 | Overview: external programs and external commands |