Solution : https://service.sap.com/sap/support/notes/1616486 (SAP Service marketplace login required)
Key words : 
template based request, terms access control 2010, user details fields, multiple users reason, multiple users, user selection, symptom create, step review, editable state, prerequisites code
Related Notes : 
       
| 1618942 | UAM : Hidden fields are visible on changing user in request | 
| 1607067 | Master Note for SAP Access Control 10.0 - Support Pack 6 |