While creating a repair ticket from POS or directly from Manage Tickets screen, you are asked to enter information related to a device you are going to repair but some time employee may forget to add that information. Employees may skip this step usually, however, it's always a good idea to record a device's details before you start the repair job on it.
so here are some of the triggers which will make it mandatory to add all those information and ticket will not be created if someone skips them.
You can go to repair module configuration from => Settings => module configuration => Repairs
How to make it mandatory to take customer information?