Read more about Order Lookup here - OneFlo Order Lookup
The Order Reference Field is indicative of the Order Lookup Integration being active in your environment.
This is configured on an Account and User Level, As such it is possible for your logged in user to not see the required field.
Account Manager Email
Hi Account Manager,
I am unable to use the "Order Lookup" feature for xxx Account.
- Username: "xxxx"
Please ensure this is enabled.