Scenario: User wants to show the Line Unique Key field value in the UI on the Sales Order.
Solution
Navigate to Customization > Lists, Records, & Fields > Transaction Line Fields > New
Label: Enter Unique Key
Type: Select Integer Number
Store Value: Remove Checkmark
Click Applies To
Sale: Enter Checkmark
Click Validation & Defaulting
Formula: Enter Checkmark
Default Value: Enter {lineuniquekey}
Click Save
Note: We won’t be able to fetch these values to the reports. If you need to have a value to be displayed in the report, you need to check the Store Value checkbox and then provide value to the field.