I think PI delivers some internal changes at proxy level (classes, interfaces or methods) that requires regeneration ... For instance, the execute_synchronous method no longer exists, instead it will be named as the service name !
> Why do we regenerate the proxies after ugradation of system from XI or PI 7.0 to PI 7.1?
We regenerate ABAP proxies only when we do some changes in XI Data Type (eithere change in field name or structure level changes) otherwise upgrading your XI system to PI7.1 will not require any proxy regeneration.
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