[ic] Tough problem: seems I loose modifiers in receipt.html

[Ubi]

 Dear all,

 I'm struggling against a very hard problem with Interchange (4.8.3,
4.8.5). I've been using Minivend since version 3 for a number of sites, so
my pages and processes are rather old and have been updated every time, but
are a bit out of the standard route, yet thay've always worked well.

 Now, I'm using some custom tags to calculate the prices of items because
I could never get satisfactory results from the standard ones, and I also
use them in pages basket.html, checkout.html, receipt.html.

 The problem is that, when it comes to page receipt.html, Interchange
seems to have forgotten about item modifiers ( [item-modifier formats]
does not work too, and returns empty values) and my calculation of prices,
done via proprietary tag mix-sale-off

 [mix-sale-off number="[nitems]" prodformat="[item-modifier formats]" ]

always returns "30".

 Is it this an Interchange problem, or I am doing something nasty here???


--- THIS IS THE TAG, QUITE TRIVIAL... ---



UserTag mix-sale-off Interpolate
UserTag mix-sale-off Order number prodformat
UserTag mix-sale-off Routine <<EOR
sub {
        my $nitems = shift;
        my $prodformat = shift;
        my $perc_mod = 1;

        my $curr_prc = 30;
        if ($prodformat eq "s1600x1200") { $curr_prc = 9 };
        if ($prodformat eq "s1024x768")  { $curr_prc = 4 };
        if ($prodformat eq "s800x600")   { $curr_prc = 3 };

        if ($nitems == 2)                    { $perc_mod = .95 };
        if (($nitems > 2) && ($nitems < 5))  { $perc_mod = .90 };
        if (($nitems > 5) && ($nitems < 10)) { $perc_mod = .85 };
        if ($nitems > 10)                    { $perc_mod = .80 };

        $curr_prc = $curr_prc * $perc_mod;
        return $curr_prc;
}
EOR