how to update resource cost in Average costing

Summary:

1.We are using Costing method as Perpetual costing and using Maintenance module.

2. We have defined a cost scenario and updated the resource rates defined as 50 USD and then Published the Scenario and Workroder has been transacted with resource cost of 50 USD

Ask here is to update the resource cost from 50 USD to 60 USD.

What is the process which needs to follow as system is not allowing the resource cost update on the scenario published.

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