How to call enhanced class method in Workflow task?

[Savitha M]

Hi All,

I have enhanced a global class from SAP by adding a new method. I would like
to call it from a workflow task, but it is not visible. Seems to be only
native methods created within the class are visible to be selected. I
searched in SDN forums, but I could not get an answer.

Also what is the best way to enhance standard workflow(which is using
classes) with custom functionality
1) Copy the standard class into new Z class and use this Z class after
implementing new methods.
                                    OR
2) Enhance the SAP standard class with new methods .

Is delegation concept possible with classes?

Could you please guide me.

Thanks & Regards,
Savitha
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