If you work with QuoteConfigurator the Quoting module in Salesforce and you need to update the Opportunity information in the header of an approved Quote in the Deal status, you can configure it this way:
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In the same way (setting fields as 'alwaysEditable') you can update approved Contracts Agreements/Promotions or Rebate Agreements. Note that if the user has the DataIntegration user role assigned, this functionality may not work correctly.