Solution : https://service.sap.com/sap/support/notes/712663 (SAP Service marketplace login required)
Key words : 
3 'maintain country field checks, country specific checks, vehicle country key, vat registration number, field landk, european union, company code, terms eu2004, eu-countries, support packages
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| 728051 | New tax number types for new EU members as of 01.05.2004 | 
| 727518 | Vstup CR do EU/CR joining EU ->> FAQ /regular update/ | 
| 653544 | EU2004:New members of Europ.Union as of 01/05/2004 | 
| 638214 | Belgium: Enhanced check of VAT registration numbers |