diff --git a/cps-service/src/test/resources/bookstore.json b/cps-service/src/test/resources/bookstore.json
index 459908b..4b8ed3d 100644
--- a/cps-service/src/test/resources/bookstore.json
+++ b/cps-service/src/test/resources/bookstore.json
@@ -1,4 +1,12 @@
 {
+   "multiple-data-tree:invoice": [
+      {
+         "ProductID": "1",
+         "ProductName": "Apple",
+         "price": "100",
+         "stock": false
+      }
+   ],
    "test:bookstore":{
       "bookstore-name": "Chapters/Easons",
       "categories": [
diff --git a/cps-service/src/test/resources/bookstore.yang b/cps-service/src/test/resources/bookstore.yang
index 2179fb9..b7a52e2 100644
--- a/cps-service/src/test/resources/bookstore.yang
+++ b/cps-service/src/test/resources/bookstore.yang
@@ -15,6 +15,34 @@
         }
     }
 
+    list invoice {
+        key "ProductID";
+        leaf ProductID {
+            type uint64;
+            mandatory "true";
+            description
+            "Unique product ID. Example: 001";
+        }
+        leaf ProductName {
+            type string;
+            mandatory "true";
+            description
+            "Name of the Product";
+        }
+        leaf price {
+            type uint64;
+            mandatory "true";
+            description
+            "Price of book";
+        }
+        leaf stock {
+            type boolean;
+            default "false";
+            description
+            "Book in stock or not. Example value: true";
+        }
+    }
+
     container bookstore {
 
         leaf bookstore-name {