To set this trigger just follow these steps:
2. Head to Store Settings.
3. Click on Module Configuration.
5. On Repairs Configuration & Settings page (as shown in the screenshot), select default Input criteria
5. Once done, click on the Save button to implement these changes.
Q. Is there any way I can disable IMEI criteria while creating a ticket?
A. yes you can do that by setting default criteria as serial and then you can disable IMEI field.