Quality is delighting customers
SAP Testing is same as manual testing but here the applications are SAP R/3 and Enterprise portal.
Whenever there is change in R/3 and Portal and You need to design test cases according the change request and test the application.
If you have knowledge of module (like HR, CRM, SD, SRM), which you are going to test would be helpful to you.
During the entire life cycle of a SAP solution, like mainframe modernization it is necessary to test the functions and performance of your solution