source: If the Primary Contractor is unable to fill the Authorized User's request in accordance with the Required Service Levels, the Secondary Contractor shall be engaged.
target: The Primary Contractor must fulfill the Authorized User's request in agreement with the Required Service Levels. If they are unable to, the Secondary Contractor will be used.
references: The Primary Contractor must fulfill the Authorized User's request in agreement with the Required Service Levels. If they are unable to, the Secondary Contractor will be used.