Hello Anonymous,

It now works, thanks to Moose::Role. I tried Moose::Role before but it didn't work. I think I made some errors with the namespaces of the files...
I thought about using a "simple" require but I can't stand the thought of using something that's not included in the Framework. I mean where's the point in using it if you just write the code like you did before?

Another error I made was calling make_immutable on the controller-class which results in an error because inheritance is not working after calling it (no sureprise, if I think about it ;( ).

Here's the part of my programm which includes the other class (as a role) and then calles the corresponding config_module sub in the inherited class.

sub load_config {
  my $self   = shift;
  my $to_load = shift;

  with "LaborBelege::AddOns::$to_load\::main";
  $self->config_module();
}
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Thanks for your advice, it finally got me on the right track.

Greetings from Germany,
Shinama