Solution : https://service.sap.com/sap/support/notes/1640629 (SAP Service marketplace login required)
Key words : 
solution implement attached correction instruction, symptom role sync, taking long time, terms access control 10, web services, repository reason, method get_role_org_level, prerequisites
Related Notes : 
       
| 1640992 | Master Note for SAP Access Control 10.0 - Support Pack 7 |