Would like to override IF_RELEASABLE_MM method behavior in transaction ME54

I would like to override the behavior of method l_releasable->is_reset_rej_allowed( ) at line 549 in include file LMERELVICI1 of function group MERELVI.
My goal is to "override" or "subclass" variable l_releasable as called from transaction ME54N. I'm not sure what the proper terminology would be. I would like to add code to the method that runs after the existing code and results in a different return value from this method in circumstances that I will define.
My SAP system is version 4.7 with component SAP_APPL at patch level SAPKH47030.
Can anyone explain how to do this?

Hi Juan Suros,
As per your requirement, you need to use the concept of Enhancements in SAP. To do this, you need to have the SAP access key. You will find the following links useful to do this:
[Link 1|http://wiki.sdn.sap.com/wiki/display/ABAP/EnhancementFramework-FunctiongroupandFunctionmoduleenhancement-ConceptandSimple+Scenario]
[Link 2|http://help.sap.com/saphelp_nw04s/helpdata/en/a0/47e94086087e7fe10000000a1550b0/content.htm]
[Link 3|Enhancement of the function module.;
Regards,
Pranaam.

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This post is similar to the one posted just before it :
[http://forum.java.sun.com/thread.jspa?threadID=5281500|http://forum.java.sun.com/thread.jspa?threadID=5281500]
I am trying to override an abstract method which has a generic argument and a problem occurs. I would like to find out whether what I am trying to do is not legal. The point of interest here is that the overriding class reduces the scope of the abstract class.
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