Generation of Secondary File 
Generation of Secondary File
Use
The secondary file ensures that the export file can also be processed outside of the SAP System. The secondary file contains all information on the structure of the tables to be used, the field strings, and infotypes.
If you transfer the export file to an third-party payroll system that uses the SAP standard file layout in the Interface Toolbox, you must regenerate the secondary file after every change in the interface format.
If you use the import program, you must regenerate the secondary file.
If the third-party payroll system uses neither the unconverted export file nor the import program from the Toolbox, then it is not necessary to regenerate the secondary file.
Activities
Generate the secondary file