During external data transfer, the R/3 system distinguishes between
The system checks the data to be transferred just as in the corresponding dialog functions.
Transferring external data to the R/3 System requires ABAP/4 experience, as you must create your own transfer program. SAP provides sample programs to make this task easier. These sample programs contain callups for function modules that control the data transfer.
Detailed information on the procedures and execution of external data transfer can be found in the SAP Library under Financials -> CO Controlling -> Controlling -> External Data Transfer.