Adding POS to the mix I’m pretty sure requires an app to work on them through the POS, otherwise your sending as an invoice or collecting payment in the admin side of things.
I’d contact shopify support for POS to confirm and feature request, then look into the apps to improve the workflow.
Hi @PaulNewton did you find a solution for this? Looking for a solution for exactly the same case. Not for repairs after buying. But repairs after using.