Usually the BAdI implementations do not allow creating new methods. Even if you manage to add, these will not be referred in the standard programs.
Also not allowed is modifying the existing methods' parameters. This is because these methods are called in the standard programs with a standard signature.
The implementations are generally meant only for adding code in the methods.
If you want to add new functionality, do in a separate custom class, and call those class methods in the BAdI implementation code.
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Bluesky
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