Modifying a Business Service
You can modify a business service providing that the change does not alter the signature or behavior of the published business service. You can change a business service in many ways, and how you change the business service depends on the business service design and the type of change that is required. Any change to a business service should be determined as part of the design process. You should ask yourself these questions to determine whether the modifications affect the published business service:
Am I adding or removing required fields in the value object?
Will these changes affect the way the existing published business service behaves?
If the answer is yes, you must create a new business service. You can copy and modify the existing business service to create a new business service.