diff --git a/BO4E/BO/BusinessObject.cs b/BO4E/BO/BusinessObject.cs
index 48e1621d..b2b0fdb3 100644
--- a/BO4E/BO/BusinessObject.cs
+++ b/BO4E/BO/BusinessObject.cs
@@ -6,6 +6,7 @@
 using System.Text.Json.Serialization;
 using BO4E.COM;
 using BO4E.meta;
+using BO4E.meta.LenientConverters;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Newtonsoft.Json.Schema;
@@ -147,6 +148,7 @@ public string? BoTyp
     [JsonPropertyName("versionStruktur")]
     [JsonPropertyOrder(2)]
     [ProtoMember(2)]
+    [System.Text.Json.Serialization.JsonConverter(typeof(AutoNumberToStringConverter))]
     public string? VersionStruktur { get; set; }
 
     /// <summary>
diff --git a/BO4ETestProject/TestAutoNumberConverter.cs b/BO4ETestProject/TestAutoNumberConverter.cs
index 6c4c0f1a..a117409a 100644
--- a/BO4ETestProject/TestAutoNumberConverter.cs
+++ b/BO4ETestProject/TestAutoNumberConverter.cs
@@ -1,6 +1,7 @@
 using System.IO;
 using BO4E.BO;
 using BO4E.meta.LenientConverters;
+using FluentAssertions;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using JsonSerializer = System.Text.Json.JsonSerializer;
 
@@ -23,4 +24,13 @@ public void TestConverter()
         var vertrag = JsonSerializer.Deserialize<Vertrag>(jsonString, options);
         Assert.IsNotNull(vertrag);
     }
+
+    [TestMethod]
+    [DataRow("{\"versionStruktur\": \"12\"}")]
+    [DataRow("{\"versionStruktur\": 12}")]
+    public void Test_Annotation_STJ(string jsonString)
+    {
+        var malo = System.Text.Json.JsonSerializer.Deserialize<Marktlokation>(jsonString);
+        malo.Should().NotBeNull().And.Subject.As<Marktlokation>().VersionStruktur.Should().Be("12");
+    }
 }