diff --git a/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/FeatureSettings.cs b/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/FeatureSettings.cs
index 817ca949..1eda73de 100644
--- a/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/FeatureSettings.cs
+++ b/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/FeatureSettings.cs
@@ -1,7 +1,9 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
+using Newtonsoft.Json.Linq;
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.Runtime.Serialization;
 using System.Text;
@@ -24,11 +26,12 @@ public FeatureSettings() { }
         /// </summary>
         /// <param name="featureName">The feature name. (required).</param>
         /// <param name="featureDescription">The feature description. (required).</param>
+        /// <param name="featureFulfillmentPolicy">The feature FulfillmentPolicy. (required).</param>
         /// <param name="sellerEligible">When true, indicates that the seller is eligible to use the feature..</param>
-        public FeatureSettings(string featureName = default(string), FeatureFulfillmentPolicy featureFulfillmentPolicy = default(FeatureFulfillmentPolicy))
+        public FeatureSettings(string featureName = default(string), FeatureFulfillmentPolicyEnum featureFulfillmentPolicy = default(FeatureFulfillmentPolicyEnum))
         {
             this.FeatureName = featureName;
-            this.featureFulfillmentPolicy = featureFulfillmentPolicy;
+            this.FeatureFulfillmentPolicy = featureFulfillmentPolicy;
         }
 
         /// <summary>
@@ -43,7 +46,8 @@ public FeatureSettings() { }
         /// </summary>
         /// <value>The feature description.</value>
         [DataMember(Name = "featureFulfillmentPolicy", EmitDefaultValue = false)]
-        public FeatureFulfillmentPolicy featureFulfillmentPolicy { get; set; }
+        [JsonProperty("featureFulfillmentPolicy", Required = Required.Always)]
+        public FeatureFulfillmentPolicyEnum FeatureFulfillmentPolicy { get; set; }
 
         /// <summary>
         /// Returns the string presentation of the object
@@ -53,7 +57,8 @@ public override string ToString()
         {
             var sb = new StringBuilder();
             sb.Append("class Feature {\n");
-            sb.Append("  FeatureName: ").Append(FeatureName).Append("\n");
+            sb.Append("  FeatureName: ").Append(this.FeatureName).Append("\n");
+            sb.Append("  FeatureFulfillmentPolicy: ").Append(this.FeatureFulfillmentPolicy).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
         }
@@ -64,7 +69,16 @@ public override string ToString()
         /// <returns>JSON string presentation of the object</returns>
         public virtual string ToJson()
         {
-            return JsonConvert.SerializeObject(this, Formatting.Indented);
+            var jsonSettings = new JsonSerializerSettings
+            {
+                NullValueHandling = NullValueHandling.Ignore,
+                Formatting = Formatting.Indented
+            };
+
+            var jsonObject = JObject.FromObject(this, JsonSerializer.Create(jsonSettings));
+            jsonObject["featureFulfillmentPolicy"] = this.FeatureFulfillmentPolicy.ToString();
+
+            return jsonObject.ToString();
         }
 
         /// <summary>
@@ -125,8 +139,10 @@ public override int GetHashCode()
     /// Variant of the image, such as &#x60;MAIN&#x60; or &#x60;PT01&#x60;.
     /// </summary>
     /// <value>Variant of the image, such as &#x60;MAIN&#x60; or &#x60;PT01&#x60;.</value>
+
+    [DefaultValue(FeatureFulfillmentPolicyEnum.Required)]
     [JsonConverter(typeof(StringEnumConverter))]
-    public enum FeatureFulfillmentPolicy
+    public enum FeatureFulfillmentPolicyEnum
     {
 
         /// <summary>
diff --git a/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/GetFulfillmentPreviewItem.cs b/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/GetFulfillmentPreviewItem.cs
index 0f80b190..e49465cc 100644
--- a/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/GetFulfillmentPreviewItem.cs
+++ b/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/GetFulfillmentPreviewItem.cs
@@ -70,7 +70,7 @@ public GetFulfillmentPreviewItem() { }
         /// The seller SKU of the item.
         /// </summary>
         /// <value>The seller SKU of the item.</value>
-        [DataMember(Name = "sellerSKU", EmitDefaultValue = false)]
+        [DataMember(Name = "sellerSku", EmitDefaultValue = false)]
         public string SellerSKU { get; set; }
 
         /// <summary>
diff --git a/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/Weight.cs b/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/Weight.cs
index 4f3d9a7d..208d7a12 100644
--- a/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/Weight.cs
+++ b/Source/FikaAmazonAPI/AmazonSpApiSDK/Models/FulfillmentOutbound/Weight.cs
@@ -39,11 +39,23 @@ public enum UnitEnum
             [EnumMember(Value = "KG")]
             KG = 1,
 
+            /// <summary>
+            /// Enum KILOGRAMS for value: KILOGRAMS
+            /// </summary>
+            [EnumMember(Value = "KILOGRAMS")]
+            KILOGRAMS = 2,
+
             /// <summary>
             /// Enum LB for value: LB
             /// </summary>
             [EnumMember(Value = "LB")]
-            LB = 2
+            LB = 3,
+
+            /// <summary>
+            /// Enum POUNDS for value: POUNDS
+            /// </summary>
+            [EnumMember(Value = "POUNDS")]
+            POUNDS =4
         }
 
         /// <summary>