Unable to create Validation rule based on "Create Requisition Using" field in How to Start Section

Summary:

Requirement is to create validation rule between "Create Requisition Using" field in How to Start Section and "Recruiting Type" field

Content (please ensure you mask any confidential information):

We are trying to create a validation rule on the Create Job Requisition redwood page based on the "Use" and "Recruiting type" condition.
Requirement is if "Create Requisition Using" is Blank Req and Recruiting Type is A then throw error or if "Create Requisition Using" is Template and Recruiting Type is B then throw error etc.
In VB Studio, Business Rules Express mode, when we add "Use?" field under condition and type the value as Blank Requisition or Existing Requisition or Template, it does not search for the existing values and does not give an option to select. If we simply hardcode the field value then also the validation does not work.