In each area of VOFM, with the exception of Structure of Group Key Formulas, SAP delivers routines using the name space from 1 to 599. SAP customers can create their own VOFM routines using the name space from 600 to 999. With Structure of Group Key Formulas, the SAP name space is 1 to 49, and the customer name space is 50 to 99. To create a new routine, follow these steps:
1. First check to see whether you can use one of the formulas delivered in the standard system.
2. Either overwrite an existing formula or enter a new number on a new line from the customer name space 600 to 999. Also enter a short description of your formula.
3. Program your formula in the ABAP editor.
4. Activate the program.
5. Enter the application if you want to use the formula in a specific application area.
6. Enter your new formula in the appropriate area in customizing. For example, a new pricing condition value formula would be assigned to a condition type or value line in a pricing procedure. As another example, a free goods calculation rule would be assigned to a free goods condition record. New VOFM routines created at a customer site are not overwritten by a software upgrade.
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