2073611 - How to block users registration to courses that have not met the prerequisite?

• How to block users registration to courses that have not met the prerequisite?
  
  
• There are two Instructor Led Training (ILT) items (A and B), where A is a prerequisite for B. Why is a user unable to register for item B when the user has not fulfilled the prerequisite (item A), but if the user registers for item A, then the user is able to register for item B (before completing the prerequisite)?

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