What does the release status schema control in Test Management?

It defines a test plan's lifecycle and controls the changeability of the test plan + its test packages. A DEFAULT schema ships.

Options: Highest/Lowest Status No (next-value range), Change Lock (status can't change the plan), Execution Lock (can't maintain execution status), Signature Strategy (useful only for REVIEW*), Target Status (after approval), Cancellation Status (after rejection).