Why the Oracle allows to inactivate an associated project task with revenue recognized?

Summary:

inactivate an associated project and task after revenue recognized causes an issue on the Unbilled and Billed (WIP) report.

Content (required):

In Contract Management, we get a warning message when we try to inactivate a an associated project task, but the system still allows us to do it, even when revenue is recognized on the task. when the project task is inactivated, it is also excluded from the Unbilled and Billed report. This causes misrepresentation on the report.

Is there a seeded setup or solution to block the contract administrator from inactivating an associated task with recognized revenue? If Not, then is customization is possible? thank you!