Got the following error when tried to deploy metadata via ant migration tool

Error: field integrity exception: unknown (required must not be specified)

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Field metadata configuration is the following:


Bit of an old question, but since there's no answer yet, I'll post my experience. I got the same message when I tried to deploy a field from sandbox A to sandbox B. The field was named Nationality__c, and at the beginning it was already present in both sandboxes as a required Text field. Then, in sandbox A, we changed the definition of the field to a picklist (which can not be required). Now, trying to deploy to sandbox B failed, with the mentioned error message.

The solution is to uncheck the "Required" checkbox on the existing field in sandbox B before deploying.

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