Solution : https://service.sap.com/sap/support/notes/840243 (SAP Service marketplace login required)
Key words : 
type   short text pt_dd02t, mgenwa        application area, generic select statementnote, made unicode compatible, unicode enabled systems, function module cnd_cust_ddic_fetch, adapter object crm_cust_cnddic, function module, adapter object, unicode system
Related Notes : 
       
| 902083 | Unicode Collection Note for CRM 4.0 |