This warning message was added in July 2020 release to prevent accidentally completing a lending request:
https://knowledge.exlibrisgroup.com/Alma/Release_Notes/2020/Alma_2020_Release_Notes
With the introduction of Rapido, we noticed this warning message popping up a lot more often, and since the default value is on "Confirm", many requests are cancelled accidentally by double-scanning. We would like to suggest that this message be set by default to "Cancel" rather than "Confirm" or being able to configure the preselected default value.
The mapping table is under: IZ Configuration > Fulfillment > Physical Fulfillment > Scan In Messages Configuration > line 3 Complete lending request.