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JO_DevJO_Dev 

This Custom Field Definition is managed, meaning that you may only edit certain attributes

How do I edit the formula of a Custom Field Definition that is managed?

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@Karanraj@Karanraj
You can't edit the management package components like the other components in your org.
Only the package provider have the ability to make changes to component and push upgrade package.

Check this help article to know more about the managed package behaviours - https://help.salesforce.com/apex/HTViewSolution?id=000004987&language=en_US