$header .= _fill($stamm->{dfvkz}, 2, '0');
$header .= _fill($stamm->{beraternr}, 7, '0');
$header .= _fill($stamm->{mandantennr}, 5, '0');
$header .= _fill($stamm->{dfvkz}, 2, '0');
$header .= _fill($stamm->{beraternr}, 7, '0');
$header .= _fill($stamm->{mandantennr}, 5, '0');