As I said before, the script works as intended.
If one would write "$zu" in a Template he would get an empty string as I don't want to expose script internals just by error.

# But if I change these lines in sub getValue from
...
    # here starts the nightmare
    # so the provide hash had no key with such name
    } else {
        # I FEAR THIS
        no strict "refs";
        # uhm, but it exists, in our namespace ? in our scope? besides
+?
        if (defined $$var){
            # if so, then take the value of the skalar 
            $result = $$var;
        } else {        
        warn "undefined Variable $var requested!";
        }
    }
...

#to
    } else {
        $result = '$'.$var;
        $result =~ s/(\$\w+)/$1/eeg;
    }
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I don't get an error

• BUT a warning in my log stating that $var has not been imported
• BUT one would get the current value of $zu

which is exactly what I try to avoid, besides, then he gets an empty string for the skalars defined in the required script.

I wouldn't ask if I had a clue on this ;-)