If holiday allowance is exceeded, update authorisation email to highlight overuse or stop admin or Manager users being able to book excess holidays without an additional step being added

An admin user, entered holiday that took them over their annual allowance, they were able to click past the warning message. When the authorisation email was sent to their line manager it did show they had a negative holiday allowance, but on quick glace its not that obvious.

Can this me made more obvious, such as negative holidays allowance appearing in red or highlighted to make it very obvious, or put a note on that their holiday allowance has been exceeded, rather than showing the remaining entitlement as -X days.

We have rules in place that stop excess holidays being taken and also holidays longer than a certain length but for Admin users and (believe this is the same for) managers can all override this. We would like additional authorisation level added (specified people such as a Director or Head of HR) if its not possible to alter the standard access for admin and Managers to stop them braking the rules that are already set within the system.

We are not able to alter out own system settings to resolve this issue, after speaking to a very helpful person (Neil) on your help site they confirmed this.