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 Secondary Contractor may be engaged. This shall happen if the Primary Contractor is unable to fill the Authorized User's request in accordance with the Required Service Levels.
references: The Secondary Contractor may be engaged. This shall happen if the Primary Contractor is unable to fill the Authorized User's request in accordance with the Required Service Levels.