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my $this_appcode = $AppCode{$ID};
$TotCst{ $this_appcode }

my $this_appcode = $AppCode{$ID};
my $this_csttype = $CstType{$ID};
$TotCst{$this_appcode}->{$this_csttype} += $InvAmnt{$ID};

$object->method(@arguments);
Class->method(@arguments);

# Here's an array...
my @array = ('foo', 'bar', 'baz');
...
# But we want to access it via the reference (pointer)
# then we need the arrow:
warn $array_ref->[2];

$TotCst{$this_appcode}{$this_csttype} += $InvAmnt{$ID};