How to prevent update of cost rate in Manage Project Budget screen

Summary:

We are looking at options to disable the Raw Cost Rate field from being edited in the Manage Project Budgets screen.

Content (please ensure you mask any confidential information):

We are using project budgets for reporting and revenue calculation purposes (Percent spent method). Named persons and HCM jobs are the resources that can be used while defining the budgets. The cost rates for these resources are coming from the cost rate overrides tab defined on the project. The requirement is to disable the person who is creating/updating the budget from changing these cost rates in the Manage Project Budgets screen.