Additional Process Information 
The example used here only refers to German travel expense accounting; in other words, all per diems/flat rates are calculated according to German travel expenses laws.
To pay trip expenses to the employee as a part of payroll, the function DREI (for Germany) must be active in schema D000. For more details, see the system documentation.
A prerequisite for recording an employee’s trips is the maintenance of the employee’s travel privileges in infotype 0017.