To prevent the roster being published if it is over budget, you're able to set this feature using the system settings.
To turn on this setting:
1. Navigate to the main menu, Platform Settings > System Settings.
2. Locate the setting 'Disable roster publishing if over budget' and change the toggle to green to turn it on.
3. Click Save Settings at the bottom of the page.
Now when the roster is published and is over budget the following will appear: