Unable to Copy DUTY_OBI Role

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I would like to create a custom role by copying ORA_GL_GENERAL_LEDGER_REPORTING_DUTY_OBI and removing one inherited role.  However, in Security Console, this DUTY_OBI role has no Copy option in the Actions dropdown.  The other variants do, like:

• ORA_GL_GENERAL_LEDGER_REPORTING_DUTY
• ORA_GL_GENERAL_LEDGER_REPORTING_DUTY_CRM
• ORA_GL_GENERAL_LEDGER_REPORTING_DUTY_HCM

The inherited role that I want to remove from the seeded General Ledger Reporting Role (ORA_GL_GENERAL_LEDGER_REPORTING_DUTY_OBI) is "Access Payroll Accounting Distribution Work Area" (ORA_PAY_ACCOUNTING_DISTRIBUTION_WA_MANAGEMENT_DUTY_OBI).