OK, since reducing my programs from over a thousand lines of code to a short snippet was not so simple, I wrote a few short snippets that show you the same problem: Program 1 (the executable):

#!/exlibris/metalib/m4_b/product/bin/perl
use demo;
{
    my $externalObject = new demo;
}
[download]

Program 2: demo.pm - an instance is created by the executable:

package demo;
require "wrapper";
use demo2;
sub new {
        my $class  = shift;
        my $params = shift;
        my $self = {};
        &call_httpd_exec();
        my $externalObject2 = new demo2;
}
[download]

Program 3: demo2.pm - an istance is created by demo.pm

package demo2;
require "wrapper";
sub new {
        my $class  = shift;
        my $params = shift;
        my $self = {};
        &call_httpd_exec();
}
[download]

Program 4: wrapper - the required program:

sub call_httpd_exec{
    print "hello world!!\n"
}

1;
[download]

When I run the executable program, I get this message:

Undefined subroutine &demo::call_httpd_exec called at demo.pm line 8.
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If I don't make demo.pm create an instance of demo2.pm there is no problem. Why do you think adding demo2.pm creates a problem?