my $count = ( $self->param( 'count' ) )[-1];
my @rows;
for my $i ( 1 .. $count ) {
    push @rows, { 	
        menge => $self->param( "menge_$i" ), 
	bezeichnung => $self->param( "bezeichnung_$i" ), 
	euro_stueck => $self->param( "euro_stueck_$i" ),
	euro_gesamt => $self->param( "menge_$i" ) * $self->param( "euro_stueck_$i" ) };
}