I have an inventory transfer transaction type that I want to restrict to a custom group of employees (To Remove items from a Quarantine area) I created a group under settings, Users and Companies, Groups.

I have a group called Inventory / Quality 

When putting a "visible" condition to the validate button in the particular workflow I get the following: 

"Only groups with an external ID can be used here.  Please choose another group or assign manually an external ID to this group" 

I am not sure if this is the best way to do this or do a record rule based on transaction type but I only want special people to run this transfer transaction.