0040938: Negative line if a Scaled prices is applied twice

diff --git a/web/org.openbravo.retail.discounts.scaledprice/js/scaledprice.js b/web/org.openbravo.retail.discounts.scaledprice/js/scaledprice.js
index 64525ef..cd70523 100644
--- a/web/org.openbravo.retail.discounts.scaledprice/js/scaledprice.js
+++ b/web/org.openbravo.retail.discounts.scaledprice/js/scaledprice.js
@@ -38,6 +38,23 @@ OB.Model.Discounts.discountRules.CEC5451CF76045E2962F3D49EA5A112A = {
             return -(line.get('discountedLinePrice') || line.get('price'));
           }
         }),
+          getCurrentDiscountedLinePrice = function (line) {
+          var i, currentDiscountedLinePrice = 0,
+              allDiscountedAmt = 0;
+          if (line.get('promotions')) {
+            for (i = 0; i < line.get('promotions').length; i++) {
+              if (!line.get('promotions')[i].hidden) {
+                allDiscountedAmt += line.get('promotions')[i].amt;
+              }
+            }
+          }
+          if (allDiscountedAmt > 0 && line.get('qty') > 0) {
+            currentDiscountedLinePrice = OB.DEC.toNumber(new BigDecimal(String(line.get('price'))).subtract(new BigDecimal(String(allDiscountedAmt)).divide(new BigDecimal(String(line.get('qty'))), 20, OB.DEC.getRoundingMode())));
+          } else {
+            currentDiscountedLinePrice = line.get('price');
+          }
+          return currentDiscountedLinePrice;
+          },
           applyingToLines = new applyingToLinesCollection(),
           appliedScaledDiscount;
 
@@ -79,6 +96,9 @@ OB.Model.Discounts.discountRules.CEC5451CF76045E2962F3D49EA5A112A = {
       scaleIndex = 1;
       for (i = 0; i < applyingToLines.length; i++) {
         ln = applyingToLines.at(i);
+        if (getCurrentDiscountedLinePrice(ln) <= 0) {
+          continue;
+        }
         appliedScaledDiscount = false;
         percentageToLine = 0;
         for (j = 0; j < ln.get('qty'); j++) {