SAP Message ACC_AA001 - Enter either a company code or an accounting principle

Diagnosis
You entered either both a company code and an accounting principle, orneither a company code nor an accounting principle and at the same timeyou chose neither the "PostDirect" indicator nor the "Der.=Real" (TreatDerived Depreciation Area as Real Area) indicator.
These entries are not allowed. In this screen, you have to make anentry in either one or the other of the two fields, or set one of theindicators.

System Response
Error message

Procedure
Enter either a company code or an accounting principle, but not both.Or, do not enter any target data, but then you have to choose one ofthe indicators.

Hint
You can only set the Treat Derived Depreciation Area as Real Area
indicator for derived depreciation areas. The system removes thisindicator during the input check if the source area is not a deriveddepreciation area.