Updated for Synergist 12.5
Requisitions are a special type of activity which can be used as a way of requesting work to be booked into the calendar bookings system. They allow you to assign a charge code and request a preferred staff resource to carry out the work.
By default your system will be created with a single activity type for use as requisitions, but you can add more through file maintenance if you wish.
Read more about them here in the calendar scheduling system.