diff --git a/AerospikeClient/Main/ResultCode.cs b/AerospikeClient/Main/ResultCode.cs
index 65b6924e..e33575c0 100644
--- a/AerospikeClient/Main/ResultCode.cs
+++ b/AerospikeClient/Main/ResultCode.cs
@@ -487,8 +487,20 @@ public sealed class ResultCode
 		/// MRT was already aborted.
 		/// Value: 125
 		/// </summary>
-		public const int MRT_ABORTED = 125;
-
+		public const int MRT_ABORTED = 125;
+
+		/// <summary>
+		/// This record has been locked by a previous update in this transaction.
+		/// Value: 126
+		/// </summary>
+		public const int MRT_ALREADY_LOCKED = 126;
+
+		/// <summary>
+		/// This transaction has already started. Writing to the same transaction with independent threads is unsafe.
+		/// Value: 127
+		/// </summary>
+		public const int MRT_MONITOR_EXISTS = 127;
+
 		/// <summary>
 		/// Batch functionality has been disabled.
 		/// Value: 150
@@ -834,8 +846,14 @@ public static string GetResultString(int resultCode)
 				return "MRT already committed";
 
 			case MRT_ABORTED:
-				return "MRT already aborted";
-
+				return "MRT already aborted";
+
+			case MRT_ALREADY_LOCKED:
+				return "This record has been locked by a previous update in this transaction";
+
+			case MRT_MONITOR_EXISTS:
+				return "This transaction has already started. Writing to the same transaction with independent threads is unsafe";
+
 			case BATCH_DISABLED:
 				return "Batch functionality has been disabled";