If you want to implement your own specific processing, such as to create an item in a document or create a follow-on document, you can do this by implementing the BAdI EXEC_METHODCALL_PPF. The application object gives you access to the document data enabling you to perform operations on it.

The method EXECUTE of the BAdI EXEC_METHODCALL_PPF has the following interface:

You create an implementation of the BAdI EXEC_METHODCALL_PPF using transaction SE19 (Business Add-Ins: Initial Implementation Maintenance Screen) assigning a filter value. You enter this filter value in the method processing details in Customizing. This BAdI is then executed whenever an action is executed with this processing type.