Solution : https://service.sap.com/sap/support/notes/481766 (SAP Service marketplace login required)
Key words : 
service performed abroad [section/§ 25c paragraph 1 reisegebührenvorschrift, official miles/kilometers allowance, cubic capacity exceeding 250 cm30, company-specific reimbursement amounts, service performances abroad, sap service marketplace, miles/kilometers traveled, miles/kilometers allowance, income-related expense, extra cost compensation
Related Notes : 
       
| 452097 | |
| 446116 | |
| 308943 | |
| 32449 | New ISO country codes |