You're using POE very incorrectly. Based on the reading of your server, here's one that should do what you want. It's not tested at all, however. People in irc.perl.org #poe may be able to help you further.

#!/usr/bin/perl
#use strict;

# use both POE server and the filter needed
use POE qw(Component::Server::TCP Filter::Stream);

my $Dest = Value("DestinationXMLLocation");
my $Src  = Value("SourceXMLLocation");

POE::Component::Server::TCP->new(
  Alias            => "sum_server",
  Port             => 11211,
  ClientFilter     => "POE::Filter::Stream",

  ClientInput => sub {
    my ($storage, $client_input) = @_[HEAP, ARG0];

    $storage->{buf} .= $client_input;

    # Shift the next request off the buffer.
    my ($req_type, $next_request, $new_buf) = parse_client_input(
      $storage->{buf}
    );

    # No request yet.  Wait for more input.
    return unless defined $next_request;

    # Replace the buffer with what's left.
    $storage->{buf} = $new_buf;

    if ($req_type eq "interface_levels_available") {
      open(FH, "<", "$Src\\interfaceLevelsAvailableResponse-OK.xml") o
+r die $!;
    }
    elsif ($req_type eq "interface_level_request") {
      open(FH, "<", "$Src\\interfaceLevelResponse-OK.xml") or die $!;
    }
    else {
      warn "ignoring illegal request: $next_request\n";
      return;
    }

    # Send the contents of the opened file.
    my $output = join("", <FH>);
    close(FH);
    $storage->{client}->put($output);
  },
);

sub parse_client_input {
  my $input_buffer = shift;

  # Up to you to define.
  # Removes one request from the beginning of $input_buffer.
  # Returns nothing if $input_buffer doesn't contain a complete reques
+t.
  # Returns the new request type, the request itself, and the remains
  # of $input_buffer on success.
  #
  # If your protocol is line-based, use POE::Filter::Line above
  # instead of POE::Filter::Stream, and then don't worry about buffer
  # management.

  my $request_type = "interface_levels_available";
  return($request_type, $input_buffer, "");
}
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