Best practice when modifying SAP Standard Development Component

Hello Experts,
What is best practice when modifying SAP Standard Development Component (Java Web Dynpro)? Iu2019m looking for the best method to do modifications to SAP Standard DC so that my changes will be kept (or need low maintenance) after a new service package (or EHP) is applied.

  'How to use Busiess Packages in Enterprise Portal 6.0' is available in this link.
Check out for the best practices.
Harini S

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