Class for Back-End Service

Hi,
Can someone please let me know what are the classes that are available for SAP_PA and SAP_PD. Since this is a standard service i am not able to find out the classes.
Thanks.
Regards,
Sriram

Refer to my webolg where i explained the relation between helper class and model class in Web Dynpro.
<a href="/people/monalisa.biswal/blog/2006/09/03/changing-java-bean-model-class-in-web-dynpro:///people/monalisa.biswal/blog/2006/09/03/changing-java-bean-model-class-in-web-dynpro
Can u explain your problem in detail?

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