Running the following code outlines my problem best. In version 1 I try to add a sub reference to another sub reference within the same hash. The result is something like $VAR1->{'1'}{'test2'}. But what I expect can be seen in the output of version 2. Can someone give me a hint what's to do to get version 1 running correctly? Cheers elLunes 
use Data::Dumper;

# VERSION 1
my $ref_1;

$ref_1->{'1'}->{'test1'}->{'key1'} = '1';
$ref_1->{'1'}->{'test1'}->{'key2'} = '2';
$ref_1->{'1'}->{'test1'}->{'key3'} = '3';
$ref_1->{'1'}->{'test2'}->{'key1'} = '4';
$ref_1->{'1'}->{'test2'}->{'key2'} = '5';
$ref_1->{'1'}->{'test2'}->{'key3'} = '6';

$ref_1->{'2'}->{'test1'}->{'key1'} = '1';
$ref_1->{'2'}->{'test1'}->{'key2'} = '2';
$ref_1->{'2'}->{'test1'}->{'key3'} = '3';
$ref_1->{'2'}->{'test2'}->{'key1'} = '4';
$ref_1->{'2'}->{'test2'}->{'key2'} = '5';
$ref_1->{'2'}->{'test2'}->{'key3'} = '6';
      
foreach my $b1 (keys %{$ref_1->{'1'}}) {
    if(exists $ref_1->{'2'}->{$b1}) {
        $ref_1->{'2'}->{$b1}->{'1'} = $ref_1->{'1'}->{$b1};
    }
}
print Dumper $ref_1;

# VERSION 2
my $ref_2;

$ref_2a->{'1'}->{'test1'}->{'key1'} = '1';
$ref_2a->{'1'}->{'test1'}->{'key2'} = '2';
$ref_2a->{'1'}->{'test1'}->{'key3'} = '3';
$ref_2a->{'1'}->{'test2'}->{'key1'} = '4';
$ref_2a->{'1'}->{'test2'}->{'key2'} = '5';
$ref_2a->{'1'}->{'test2'}->{'key3'} = '6';

$ref_2b->{'2'}->{'test1'}->{'key1'} = '1';
$ref_2b->{'2'}->{'test1'}->{'key2'} = '2';
$ref_2b->{'2'}->{'test1'}->{'key3'} = '3';
$ref_2b->{'2'}->{'test2'}->{'key1'} = '4';
$ref_2b->{'2'}->{'test2'}->{'key2'} = '5';
$ref_2b->{'2'}->{'test2'}->{'key3'} = '6';
      
foreach my $b1 (keys %{$ref_2a->{'1'}}) {
    if(exists $ref_2b->{'2'}->{$b1}) {
        $ref_2b->{'2'}->{$b1}->{'1'} = $ref_2a->{'1'}->{$b1};
    }
}
print Dumper $ref_2b;

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In reply to Hash reference Problem by elLunes

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