Solution : https://service.sap.com/sap/support/notes/634933 (SAP Service marketplace login required)
Key words : 
terms contact persons data exchange, sales area data, customer group fields, contact persons, data exchangeof, fields kvgr1-5, kvgr1-5 fields, properly updated, set properly, correction instructions
Related Notes : 
       
| 629487 | CRM 3.0 / CRM 3.1: Functional Enhancements |