The exact working syntax is here:
I had replied in the other post but perhaps you didn’t see it.
Don’t worry about this, I understand.
I know that you have a good knowledge about SME and Nethserver, but I really don’t understand why you persist to answer this way. It’s really counter productive.
If you know and don’t want to share your knowledge… Stay in your ivory tower, but don’t post unpleasant answer. 