Issue #2374713 by skyhawk669: Unable to remove coupons from discount edit screen

        // attached to no other discounts, delete it completely.

        $remove_coupon = commerce_coupon_load_by_code($original_coupon->code);

        $wrapper = entity_metadata_wrapper('commerce_coupon', $remove_coupon);

        $delete = TRUE;

        if (!empty($form_state['commerce_discount']->discount_id)) {

          foreach ($wrapper->commerce_discount_reference->value() as $discount) {

            if ($discount->discount_id != $form_state['commerce_discount']->discount_id) {

              $delete = FALSE;

          foreach ($wrapper->commerce_discount_reference->value() as $delta => $discount) {

            if ($discount->discount_id == $form_state['commerce_discount']->discount_id) {

              // Break the reference from this coupon to the discount currently

              // being edited in the form. @TODO: why is the wrapper not working

              // here?

              $language = field_language('commerce_coupon', $remove_coupon, 'commerce_discount_reference');

              unset($remove_coupon->commerce_discount_reference[$language][$delta]);

            }

          }

        }

        if ($delete) {

        // If no discounts remain, delete the coupon.

        if (empty($remove_coupon->commerce_discount_reference[$language])) {

          commerce_coupon_delete($original_coupon->coupon_id);

        }

        else {

          // If we are not deleting, save the coupon since we eliminated one or

          // more of its discount references.

          $wrapper->save();

        }

        // Force rules rebuild.

        $rebuild_rules = TRUE;

      }

    }

  }

  }

  // Rebuild the rules again if coupon added or deleted.

  if($rebuild_rules) {