Validate requisition number of opening with position headcount

Summary:

need to validate the number of openings in the requisition creation screen with the available position Headcount

Content (please ensure you mask any confidential information):

If the number of openings value is grater than vacant count of the selected position then error.

i.e. Accountant Officer head count is 1 and vacant is 0 if user trying to create requisition then show error.

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

24A

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