diff --git a/docs/demo/src/WTA.Shared/Attributes/OneToManyAttribute.cs b/docs/demo/src/WTA.Shared/Attributes/OneToManyAttribute.cs
index 5197be21..d78bf874 100644
--- a/docs/demo/src/WTA.Shared/Attributes/OneToManyAttribute.cs
+++ b/docs/demo/src/WTA.Shared/Attributes/OneToManyAttribute.cs
@@ -1,11 +1,14 @@
 namespace WTA.Shared.Attributes;
 
-public class OneToManyAttribute<TEntity>
+[AttributeUsage(AttributeTargets.Property)]
+public class OneToManyAttribute<TEntity> : Attribute
 {
-    public Type Type { get; set; } = null;
-    public OneToManyAttribute<TEntity>(string property)
+    public Type Type { get; set; } = null!;
+    public string? Property { get; }
+
+    public OneToManyAttribute(string? property = null)
     {
-        this.Type=typeof(TEntity);
-        this.Property=Property;
+        this.Type = typeof(TEntity);
+        this.Property = property;
     }
 }