diff --git a/Xero.NetStandard.OAuth2/Model/Accounting/TrackingOption.cs b/Xero.NetStandard.OAuth2/Model/Accounting/TrackingOption.cs
index 82c680f0..87fcc3f3 100644
--- a/Xero.NetStandard.OAuth2/Model/Accounting/TrackingOption.cs
+++ b/Xero.NetStandard.OAuth2/Model/Accounting/TrackingOption.cs
@@ -53,7 +53,13 @@ public enum StatusEnum
             /// Enum DELETED for value: DELETED
             /// </summary>
             [EnumMember(Value = "DELETED")]
-            DELETED = 3
+            DELETED = 3,
+
+            /// <summary>
+            /// Enum UNKNOWN for value: Empty string
+            /// </summary>
+            [EnumMember(Value = "")]
+            UNKNOWN = 4            
 
         }