Validate requisition number of opening with position headcount
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.
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