The process that allows you to change the qualifier back to cost center qualifier after a consultant accidentally designated the cost center segment as the natural account is to change and save the segment qualifier. You can change the segment qualifier using the Manage Chart of Accounts Structures task in Setup and Maintenance. You can only change segment qualifiers before deploying flexfield metadata changes for validation and activation. You do not need to create a new chart of accounts, as this is not necessary and will increase complexity and maintenance. You do not need to delete the segment and create a new segment with the correct qualifier, as this will affect existing values and journals. You do not need to delete the chart of accounts and create a new one, as this will affect existing structures and instances. Reference: Oracle Financials Cloud: General Ledger 2022 Implementation Professional Objectives - Define Chart of Accounts 12