A more desirable option would be to have the picker only present people from a specific group in the select list, but given this option is not available I need to validate the list of users that were selected to ensure they are all in a specific group. The following code doesn't work, but I hope it conveys what I'm trying to accomplish.
def checkfield = customfieldManager.getCustomFieldObjectByName("name of custom field");
flag = groupManager.isUserInGroup(checkfield[i].name, 'group_name');
You might find these custom field add-ons useful.
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