MSG Control - Email dynamic header

MSG Control - Email dynamic header

Hi,

I have send Emails from Zenon with very specific header. 

<STATIC_TEXT><DYNAMIC_TEXT>

Where <STATIC_TEXT> is always: 3613$1$
And <DYNAMIC_TEXT> is like: 
0bfcb947-6db0-1f5f-816d-b5584d000033

I fought that I will add the static text in global options of the Message Control and then I will add Variable Value in project options of Message Control. Right now I have two problems:

1. After Static text is always `: ` like: 3613$1$: <DYNAMIC_TEXT> is it possible to somehow remove this?

2. I have a problem with adding value of internt STRING variable. When I've typed this:
%<NAME_OF_VAR>;
I've got exactly the same text in header, like: 3613$1$: %<NAME_OF_VAR>;

But when I type this: 
$@Achtung;%<NAME_OF_VAR>;
I get this: 3613$1$: 
Achtung---

Is there any solution that will meet the conditions of the header.