Warning message associated with groups

[Polyanna Silva]

I need to insert a warning and blocking message associated with specific groups. How can I do this?
Currently I'm using Business Rules, but I haven't implemented them correctly.

[SanjivMeher]

When do you want to show the warning or block message?

It depends on your use case. You can use Business Rule or Client Script to show the message.

Also if you can post the current BR script you have?

[Polyanna Silva]

The message needs to be displayed when a specific group is selected; the script I created is associated with both input and output groups.
I'll send the standard script:
(function executeRule(current, previous /*null when async*/) { var allowedGroups = ['Group A', 'Group B', 'Group C']; var destinationGroups = ['Group D', 'Group E', 'Group F']; if (destinationGroups.indexOf(current.assignment_group.name) > -1 && allowedGroups.indexOf(previous.assignment_group.name) === -1) { gs.addErrorMessage('You do not have permission to assign to this group.'); current.assignment_group = previous.assignment_group; // Reverts the change } })(current, previous);

I didn't do it through the Client Script because it's associated with a catalog item, and I need it to be associated with a group.