You can change the SAP standard process flow for various callup points of the valuation run by using your own function modules. To do this, use the business transaction events method. You can find information about this method in the Implementation Guide under Financial Accounting Global Settings. Select the activity Use business transaction events.

You can use your own function modules for the following callup points in the valuation run:

• Selecting open items
• Deselecting open items
• Algorithm for calculating the discounted amount
• Transferring the data, saving the valuation per item, and creating postings
• Group formation of open items

How you use the business transaction events method is described in Use business transaction events in the Implementation Guide under Financial Accounting Global Settings.