I think your code is doing something in reverse, noticed that I need to keep the values in the node where CODE => 10. But if I change the value in "Number" and run the code, it gets overwritten from the value in the node with "6":
use strict;
use warnings;
use Data::Dumper;

my $test_data = [
    {'ID' => '1212', 'Name' => 'JOE'  , 'Number' => 'XY1', 'CODE' =>  
+'6',},   
    {'ID' => '1212', 'Name' => ''     , 'Number' => 'WW3', 'CODE' => '
+10',},
    {'ID' => '4456', 'Name' => 'MARIA', 'Number' => 'TYX', 'CODE' =>  
+'6',},
    {'ID' => '4456', 'Name' => ''     , 'Number' => 'TYX', 'CODE' => '
+10',},
    {'ID' => '8765', 'Name' => 'JEAN' , 'Number' => 'HPO', 'CODE' =>  
+'6',},
];

my @result;
foreach my $data ( @{ $test_data } ) {
    next if !$data->{Name};
    my $id = $data->{ID};
    push @result, $data;
    foreach my $temp ( @{ $test_data } ) {
        if (!$temp->{Name} and ($temp->{ID} eq $id)) {
            $result[-1]->{CODE} = $temp->{CODE};
            last;
        }
    }
}

print Dumper(\@result);

[download]

When it should be like this after running the code: 
 {'ID' => '1212', 'Name' => 'JOE'     , 'Number' => 'WW3', 'CODE' => '
+10',},

[download]

In reply to Re^2: Add value from one array element into another of same ID by Anonymous Monk
in thread Add value from one array element into another of same ID by Anonymous Monk

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