Is there is a way to restrict deletions at the bill plan level?

Summary:

We have implemented a solution where the project rate override is assigned at the bill plan level within the contract. In cases where rate changes are applied retrospectively, or the customer identifies an incorrect role assignment, the customer deletes the incorrect role and assigns the correct one at the bill plan level.

We currently have an integration in place that captures and transfers all role assignments to a third-party system. When a role is added, the integration detects the change and processes the corresponding record accordingly. However, in the case of deletions, this detection does not occur, as Oracle allows modifications at the bill plan level without requiring a contract amendment.