diff --git a/zero.Core/Blueprints/Blueprint.cs b/zero.Core/Blueprints/Blueprint.cs
index 3642883a..4a448556 100644
--- a/zero.Core/Blueprints/Blueprint.cs
+++ b/zero.Core/Blueprints/Blueprint.cs
@@ -15,18 +15,14 @@ namespace zero.Core.Blueprints
   {
     public List<BlueprintField<T>> UnlockedFields { get; private set; } = new();
 
-    protected static string[] DefaultFields { get; set; } = new[] { "name", "alias", "key", "sort", "isActive", "hash", "languageId", "createdById", "createdDate", "lastModifiedById", "lastModifiedDate", "blueprint" };
+    /// <summary>
+    /// These fields are not copied by the ObjectCloner 
+    /// as they are either locked or copied manually by ApplyDefaults()
+    /// </summary>
+    protected static string[] DefaultUncopyFields { get; set; } = new[] { "id", "url", "name", "alias", "key", "sort", "isActive", "hash", "languageId", "createdById", "createdDate", "lastModifiedById", "lastModifiedDate", "blueprint" };
 
 
-    public Blueprint() : base(typeof(T))
-    {
-      //Sync(x => x.Name);
-      //Sync(x => x.Alias);
-      //Sync(x => x.Sort);
-      //Sync(x => x.IsActive);
-      //Sync(x => x.LanguageId);
-      //Sync(x => x.Key);
-    }
+    public Blueprint() : base(typeof(T)) { }
 
 
     /// <summary>
@@ -43,7 +39,7 @@ namespace zero.Core.Blueprints
 
       // copy all properties which are synced from the blueprint to the model
       ApplyDefaults(blueprint, model);
-      ObjectCloner.CopyProperties(blueprint, model, DefaultFields.Union(model.Blueprint.Desync).ToArray());
+      ObjectCloner.CopyProperties(blueprint, model, DefaultUncopyFields.Union(model.Blueprint.Desync).ToArray());
 
       return model;
     }
diff --git a/zero.Core/Blueprints/BlueprintChildInterceptor.cs b/zero.Core/Blueprints/BlueprintChildInterceptor.cs
new file mode 100644
index 00000000..3060bacc
--- /dev/null
+++ b/zero.Core/Blueprints/BlueprintChildInterceptor.cs
@@ -0,0 +1,50 @@
+using Microsoft.Extensions.Logging;
+using Raven.Client.Documents.Session;
+using System.Threading.Tasks;
+using zero.Core.Collections;
+using zero.Core.Database;
+using zero.Core.Entities;
+
+namespace zero.Core.Blueprints
+{
+  public class BlueprintChildInterceptor : CollectionInterceptor
+  {
+    protected IZeroContext Context { get; set; }
+
+    protected IZeroStore Store { get; set; }
+
+    protected ILogger<BlueprintChildInterceptor> Logger { get; set; }
+
+    protected IBlueprintService BlueprintService { get; set; }
+
+
+    public BlueprintChildInterceptor(IZeroContext context, IZeroStore store, ILogger<BlueprintChildInterceptor> logger, IBlueprintService blueprintService)
+    {
+      Context = context;
+      Store = store;
+      Logger = logger;
+      BlueprintService = blueprintService;
+    }
+
+    /// <inheritdoc />
+    public override bool CanRun(Parameters args)
+    {
+      // this interceptor does only work for child entities
+      return (args.Session as AsyncDocumentSession)?.DatabaseName != Context.Options.Raven.Database;
+    }
+
+
+    /// <inheritdoc />
+    public override Task<InterceptorResult<ZeroEntity>> Deleting(DeleteParameters args)
+    {
+      if (args.Model.Blueprint != null)
+      {
+        InterceptorResult<ZeroEntity> result = new();
+        result.Result = EntityResult<ZeroEntity>.Fail("@blueprint.errors.cannotDeleteChild");
+        return Task.FromResult(result);
+      }
+
+      return base.Deleting(args);
+    }
+  }
+}
diff --git a/zero.Core/Blueprints/BlueprintInterceptor.cs b/zero.Core/Blueprints/BlueprintInterceptor.cs
index 096eed8b..545cae82 100644
--- a/zero.Core/Blueprints/BlueprintInterceptor.cs
+++ b/zero.Core/Blueprints/BlueprintInterceptor.cs
@@ -3,13 +3,12 @@ using Raven.Client.Documents;
 using Raven.Client.Documents.Session;
 using System.Collections.Generic;
 using System.Threading.Tasks;
-using zero.Core.Blueprints;
 using zero.Core.Collections;
 using zero.Core.Database;
 using zero.Core.Entities;
 using zero.Core.Extensions;
 
-namespace zero.Core.Routing
+namespace zero.Core.Blueprints
 {
   public class BlueprintInterceptor : CollectionInterceptor
   {
diff --git a/zero.Core/Utils/ObjectCloner.cs b/zero.Core/Utils/ObjectCloner.cs
index 0c76c979..7daf97e6 100644
--- a/zero.Core/Utils/ObjectCloner.cs
+++ b/zero.Core/Utils/ObjectCloner.cs
@@ -46,7 +46,6 @@ namespace zero.Core.Utils
 
         if (property.PropertyType.IsValueType || property.PropertyType.IsEnum || property.PropertyType.Equals(STRING_TYPE) || propertyValue == null || propertyValue is IEnumerable)
         {
-          Console.WriteLine("copy: " + propertyNameWithPrefix);
           property.SetValue(target, propertyValue, null);
         }
         else if (property.PropertyType.IsClass)
diff --git a/zero.Web.UI/app/core/editor-blueprint.ts b/zero.Web.UI/app/core/editor-blueprint.ts
index a696d52f..ee204095 100644
--- a/zero.Web.UI/app/core/editor-blueprint.ts
+++ b/zero.Web.UI/app/core/editor-blueprint.ts
@@ -21,7 +21,7 @@ function canUnlock(config, model, field)
 {
   if (!config || !model || !model.blueprint)
   {
-    return true;
+    return false;
   }
 
   return config.unlocked.indexOf(field.path) > -1 
@@ -49,7 +49,7 @@ async function lock(config, model, field)
 }
 
 
-async function unlock(config, model, field)
+function unlock(config, model, field)
 {
   model.blueprint.desync.push(field.path);
 }
diff --git a/zero.Web/Defaults/ZeroBackofficePlugin.cs b/zero.Web/Defaults/ZeroBackofficePlugin.cs
index 0ee4f7b6..54b95295 100644
--- a/zero.Web/Defaults/ZeroBackofficePlugin.cs
+++ b/zero.Web/Defaults/ZeroBackofficePlugin.cs
@@ -53,6 +53,7 @@ namespace zero.Web.Defaults
 
       zero.Interceptors.Add<ZeroEntityRouteInterceptor>(gravity: 100);
       zero.Interceptors.Add<BlueprintInterceptor>(gravity: -1);
+      zero.Interceptors.Add<BlueprintChildInterceptor>(gravity: -1);
     }
 
 
@@ -138,6 +139,7 @@ namespace zero.Web.Defaults
 
       services.AddScoped<IBlueprintService, BlueprintService>();
       services.AddScoped<BlueprintInterceptor>();
+      services.AddScoped<BlueprintChildInterceptor>();
 
       services.AddScoped<ZeroEntityRouteInterceptor>();
     }
diff --git a/zero.Web/Resources/Localization/zero.en-us.json b/zero.Web/Resources/Localization/zero.en-us.json
index 894fef53..df1ba925 100644
--- a/zero.Web/Resources/Localization/zero.en-us.json
+++ b/zero.Web/Resources/Localization/zero.en-us.json
@@ -711,6 +711,9 @@
       "goToChild": "View child",
       "settingsButton": "Settings",
       "xUnlocked": "{count} unlocked"
+    },
+    "errors": {
+      "cannotDeleteChild": "Entities which are synchronized with a blueprint cannot be deleted"
     }
   },