Solution : https://service.sap.com/sap/support/notes/637429 (SAP Service marketplace login required)
Key words : 
remote sap easy access menu fails, remote sap easy access menu exists, remote sap easy access menu, trusted system>rfc_client <client number, sap easy access menu, trusted system>rfc_equser yrfc_user ' 'rfc_info ' ', actvt 16rfc_name smtr_navigation_modulesrfc_type fugrnote, profile generator reason, input smtr_navigation_modules due, actvt 16rfc_sysid <id
Related Notes : 
       
| 128447 | Trusted/trusting systems |