Apply coupon discount to more than one line item

This should work for you ...

Edit the file:
/includes/modules/order_total/ot_coupon.php

and add the code in RED:

        if (strval($orderTotalDetails['orderTotal']) >= $coupon->fields['coupon_minimum_order'])
        {
[B]if ($coupon->fields['coupon_type'] == 'F' || $coupon->fields['coupon_type'] == 'O') {
  global $cart;
  $products = $_SESSION['cart']->get_products();
  $coupon_product_count = 0;
  for ($i=0; $i<sizeof($products); $i++) {
    if (is_product_valid($products[$i]['id'], $coupon->fields['coupon_id'])) {
      $coupon_product_count += $_SESSION['cart']->get_quantity($products[$i]['id']);
    }
  }
//$messageStack->add_session('checkout_payment', 'Coupon cont: ' . $coupon_product_count, 'caution');
}
[/B]          switch($coupon->fields['coupon_type'])

Then edit the line:

            case 'F':
              $od_amount['total'] = zen_round($coupon->fields['coupon_amount'] * ($orderTotalDetails['orderTotal']>0)[B] * $coupon_product_count[/B], $currencyDecimalPlaces);
              $od_amount['type'] = $coupon->fields['coupon_type']; // amount off 'F' or amount off and free shipping 'O'
              $ratio = $od_amount['total']/$orderTotalDetails['orderTotal'];
              break;

Works beautifully! Thank You!

You are most welcome ... thanks for the update that this works for you ...

I have built this into Zen Cart v1.6 the ability to have this feature and set it per Discount Coupon ...