anyway, others may profit from this

use strict;
use warnings;
use Data::Dump qw/pp dd/;

my @in =
  (
   { CC => "X5667", ID => 11, Name => "Mary" },
   { CC => "X456", ID => 10, Name => "Joe" },
   { CC => "P45", ID => "X2", Name => "Carl" },
   { CC => "PK1", ID => 12, Name => "Jim" },
   { CC => "X5667", ID => 11, Name => "Mary" },
  );


# --- Version1 ID deserves its name
my %seen1;
my @out1 = grep { ! $seen1{ $_->{ID} }++ } @in;
pp \@out1;


# --- Version2 combine values to one multi-dim key
my %seen2;
my @out2 = grep { ! $seen2{ $_->{ID}, $_->{Name}, $_->{CC} }++ } @in;
pp \@out2;
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