Customizing Web Dynpro for CATS Approval

Hi experts,
I would like to implement some additional logics when the CATS is approved by managers in MSS.
After tracing the codes, I located an ABAP class "CL_MSS_CAT_APPR_TR_BUFFER" that performs the approval actions in R/3.
Currently, I am considering to copy and edit a ZCL_MSS_CAT_APPR_TR_BUFFER to add additional logics to the "IF_MSS_CAT_APPR_TR_PROCESSOR~SAVE". But, here are my questions:
1/ Since there is no object delegation in BO, how can I "delegate" the objects from CL_MSS_CAT_APPR_TR_BUFFER to the z-class ?
2/ If no delegation possible, is it possible to change the action mapping s.t. ESS calls to the Z-Class instead of the standard class?
3/ If it cannot be done with action mapping, does it mean that customized Dynpro developments required ?
Sorry that I don't know much about ESS and Dynpro.
Please offer detailed steps when possible.
Many Thanks.

I don't believe that your question has been asked in the correct forum. This forum is for questions directly related to Web Dynpro ABAP development only.
However a quick suggestion (although unrelated to WDA). Instead of copying the class, consider using the enhancement framework instead. You can use a pre, post or override method to extend the logic of the SAVE method.

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i am new to web dynpro for java.i have already done an application
"Creating a Web Dynpro Application Accessing ABAP Functions" this application
have good document on sdn.
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[see here|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.highlightedcontent?documenturi=%2flibrary%2fuser-interface-technology%2fwdJava%2FHowtoHandleExceptionsEffectivelyWhileWorkingwithWebDynproJava%28WDJ%29.pdf]

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Hi
Promise this time u will not say "Thanks for nothing".(It might we don't have any reply for that or most of time question doesn't contain full explanations )
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