This doesn't answer your question but:

sub ReadData ($$) {
    my ($self, $filename) = @_;
    my $ar_returnvalue = [];
    if (!-e "$filename") {
        Carp::carp("File [$filename] does not exist");
        return undef;
    }
    open (FLATFILE, '<', $filename) or Carp::croak("Cannot open file [
+$filename]");
    while (<FLATFILE>) {
        chomp;
        push (@{$ar_returnvalue}, Interfaces::FlatFile::ReadRecord($se
+lf, $_));
    }
    close (FLATFILE);
    return $ar_returnvalue;
} ## end sub ReadData ($$)
[download]

You are using prototypes but prototypes were introduced to allow programmers to imitate Perl's built-in functions, not for user code per se.    FMTEYEWTK on Prototypes in Perl

You are testing for the existence of a file twice, first with stat and then with open.    In the stat test you are unnecessarily copying the file name to a string before testing it.    What's wrong with always quoting "$vars"?

You should include the $! variable in your error messages so you know why they failed.

        $hr_returnvalue->{$CurrentColumnName} =~ s/^\s*(.*?)\s*$/$1/; 
+   # Trim whitespace
[download]

That is usually written as:

        s/^\s+//, s/\s+$// for $hr_returnvalue->{$CurrentColumnName}; 
+   # Trim whitespace
[download]

Which avoids unnecessary substitution.

                if ($self->datatype->[$_] =~ /^(?:CHAR|VARCHAR|DATE|TI
+ME|DATETIME)$/) {
                    $hr_returnvalue->{$CurrentColumnName} = sprintf ("
+%s", $self->standaard->[$_]);
                } else {
                    $hr_returnvalue->{$CurrentColumnName} = $self->sta
+ndaard->[$_];
                }
[download]

What is the sprintf doing that the simple assignment is not doing?    It looks like you don't need this test at all.

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