Creating Credit Memos 
Use
You use this function to create credit memos for attendance fees (whole or in part) that have already been billed in Training and Event Management.
Prerequisites
Attendance fees must have already been successfully billed.
Procedure
On the SAP Easy Access screen, in the SAP Standard Menu choose Human Resources ®
Training and Events ® Billing. The selection screen of the billing and credit memo program appears.
Specify whether you want to start the program with a business event, a business event type, or a business event group by selecting the relevant option.
In the Object ID field, enter the details according to your selection in step 2. You can make a multiple selection if required.
Enter the reporting period.
Select already billed attendees.

Since you can only create credit memos for attendance fees that have already been billed, any other selection for list output would result in an error message.
If required, change the billing document date. In this case, it refers to the date the credit memo should be created. The default date proposed by the system is the current date.
Choose Execute. A list screen appears displaying attendees that have been billed for the selected business event.
Select the attendees for whom you want to create credit memos and choose Create credit memo.
A dialog box appears in which you can specify the amount (whole or part) to be credited.
Save your entries.
Result
You have created a credit memo.