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Hi @Manpreet1
You can't do that, especially on Recipient as you will break ALL the links that exist around the recipient entity. You can have ONLY 1 Primary Key. Define your 2nd key as a unique index instead of a primary key. it will achieve the same result and you won't break the standard data schema.
See this page to find out how to create an index in your recipient schema extension
Hope this helps,
Thanks
Denis