Solution : https://service.sap.com/sap/support/notes/1262109 (SAP Service marketplace login required)
Key words : 
execute rfc function modules, role 'sap_xrpm_user' add, authorization object s_rfc, rfc object, role sap_xrpm_user, terms sap_xrpm_user, error messages, current user, authority reason, sp deployment
Related Notes : 
       
| 1156407 | SAP ERP Enhan.Pk.4 SP Stack 01(11/2008) - Release Info. Note |