win32::ole tableau dynamique excel - suppression du soustotal

J'écris prog Perl pour automatiser la creation d'un fichier excel à partir de données provenant de diverses sources.

Je réalise un tableau croisé dynamique.
j'essaie de supprimer les soustotaux mais cela retourne une erreur.

Citation:

Can't modify non-lvalue subroutine call at testexcel.pl line 52.

Le code est ci dessous - petit exemple.
La macro2 en VBA marche....

Je n'arrive pas à trouver ce qui coince.

Code:

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#!/usr/bin/perl
 
use Win32::OLE;
use Win32::OLE::Const 'Microsoft Excel';
use constant True  => 1;
use constant False => 0;
 
# Start Excel and make it visible
#  $xlApp = Win32::OLE->new('Excel.Application');
my $xlApp = Win32::OLE->GetActiveObject('Excel.Application');
unless($xlApp)
{
  $xlApp = new Win32::OLE('Excel.Application', \&QuitApp)
               or die "Could not create Excel Application object";
}
sub QuitApp
{
    my ($object) = @_;
    $object->Quit();
}
$xlApp->{Visible} = 1;
 
# Create a new workbook
$xlBook = $xlApp->Workbooks->Add;
 
# Our data that we will add to the workbook...
$mydata = [["Item",     "Category", "Price"],
           ["Nails",    "Hardware",  "5,25"],
           ["Shirt",    "Clothing", "23,00"],
           ["Hammer",   "Hardware", "16,25"],
           ["Sandwich", "Food",      "5,00"],
           ["Pants",    "Clothing", "31,00"],
           ["Drinks",   "Food",      "2,25"]];
 
# Write all the data at once...
$rng = $xlBook->ActiveSheet->Range("A1:C7");
$rng->{Value} = $mydata;
 
# Create a PivotTable for the data...
$tbl = $xlBook->ActiveSheet->PivotTableWizard(1, $rng, "", "MyPivotTable");
$tbl->{ManualUpdate} = True;
 
# Set pivot fields...
$tbl->AddDataField ( $tbl->PivotFields("Price"), "XPrice", xlSum);
$tbl->AddFields ( { RowFields => ['Category', 'Item'] });
$tbl->PivotFields("XPrice")->{NumberFormat}   = "# ##0,00";
$tbl->PivotFields("Category")->{Orientation} = xlRowField;
$tbl->PivotFields("Category")->{Position}    = 1;
$tbl->PivotFields("Item")->{Orientation}     = xlRowField;
$tbl->PivotFields("Item")->{Position}        = 2;
 
$tbl->PivotFields("Item")->Subtotals(1)      = False;
 
#Sub Macro2()
#    ActiveSheet.PivotTables("MyPivotTable").PivotFields("Item").Subtotals(1) = False
#End Sub
 
$tbl->{ManualUpdate} = False;
$tbl->{ManualUpdate} = True;
$tbl->PivotCache->Refresh;