Your are building new "$result" objects for each PERSON.

Try moving the "new LDIF" to outside of the loop: 

my $ldif_OUT = Net::LDAP::LDIF->new( "buildAD.ldif", "a", wrap=>40 );
while (<PERSON>){
    chomp;
    $dn = $ldap->search( #return only the employeeID DN
            base => "$BASEDN",
            filter => "(&(objectClass=user)(employeeID=$_))",
            scope => "sub",
            attrs => ['1.1']
            );
        next unless $dn; # Make sure something is returned..
    while( my $entry = $dn->pop_entry() )
    {
      $ldif_OUT->write_entry($entry);
    }
    print OUT "changetype: modify";
    print OUT "replace: manager";
    print OUT "manager: dn","\n";
}
$dn = $ldap->unbind;  #session ends

[download]
(Minimalistic error-checking added..)

     Syntactic sugar causes cancer of the semicolon.        --Alan Perlis

In reply to Re^5: Perl Builds an LDIF by NetWallah
in thread Perl Builds an LDIF by rfransix

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