Solution : https://service.sap.com/sap/support/notes/774410 (SAP Service marketplace login required)
Key words : 
parameters            importing  attribute_path reference type string            importing, prerequisites missing unicode-multicode mapping check, create public instance method set_gv_showlistname, refenece  type string pass, ' buttonthe search values, 'search request' part, run transaction se24, reference type, open advanced search, oic result list
Related Notes : 
       
| 902083 | Unicode Collection Note for CRM 4.0 |