How can we update an existing accounting method

Summary:

We have existing accounting methods used in Primary and Secondary Ledgers by GL. We have Oracle Payroll integrating with GL. So wanted to add the rule sets created for Payroll to the existing accounting methods. When I try to navigate to the accounting method and in journal entry rule set assignments - Payroll tab I don't see the options to create or edit. But for Payables, I can see create/update and activate button. Any help will be appreciated.

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