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has anybody been able to show a message / error to a user on button click, if certain criteria are not met? i'm struggling to figure out how i might be able to do this

e.g. on a sales order a user can click a button to get a freight quote. if there is no ship method set, i want to display a message to the user that they need to set one.

Add the button with User Event script.
Add a client script that has the function you want to  call when you want to display a message. Or do you know this bit just not sure about the actual message generation?

you could alert and return false from your function.

and apologies if you were looking to do this in a workflow, just realised you posted this in "SuiteFlow" not "SuiteScript" channel :man-facepalming:

Thanks, yeah I already knew how to do this via script. Was asking about doing it via workflow.

I got it to work, had to switch the action in the failed state to return user error on Entry, not on Before Record Load