Solution : https://service.sap.com/sap/support/notes/1651365 (SAP Service marketplace login required)
Key words : 
search criteria shows connector, prerequisites real-time search, click add button, choose entry 'multiple', terms access request 2010, search result, access request, multiple users, field request, creating request
Related Notes : 
       
| 1658100 | UAM: Initial user search is turned on for multiple | 
| 1640992 | Master Note for SAP Access Control 10.0 - Support Pack 7 |