NexGen Helpdesk : Restrict employees from raising tickets on behalf of senior position employees

Summary:

My client requirement states that "When an employee tries to create a helpdesk request from "MyHelp" They want to restrict employees from raising tickets on behalf of someone who is at higher level than their position

eg. If the employee belongs to Associate level , they should not be able to raise ticket for Senior Managers or Directors etc.
Is there any validation that we can define for primary point of contact field ?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):