diff --git a/src/Umbraco.Core/Services/IdkMap.cs b/src/Umbraco.Core/Services/IdkMap.cs
index 411316fca2..bd3acd5527 100644
--- a/src/Umbraco.Core/Services/IdkMap.cs
+++ b/src/Umbraco.Core/Services/IdkMap.cs
@@ -10,7 +10,7 @@ namespace Umbraco.Core.Services
     {
         private readonly IDatabaseUnitOfWorkProvider _uowProvider;
         private readonly ReaderWriterLockSlim _locker = new ReaderWriterLockSlim();
-        
+
         private readonly Dictionary<int, TypedId<Guid>> _id2Key = new Dictionary<int, TypedId<Guid>>();
         private readonly Dictionary<Guid, TypedId<int>> _key2Id = new Dictionary<Guid, TypedId<int>>();
 
@@ -39,8 +39,8 @@ namespace Umbraco.Core.Services
             int? val;
             using (var uow = _uowProvider.GetUnitOfWork())
             {
-                val = uow.Database.ExecuteScalar<int?>("SELECT id FROM umbracoNode WHERE uniqueId=@id AND nodeObjectType=@nodeObjectType",
-                    new { id = key, nodeObjectType = GetNodeObjectTypeGuid(umbracoObjectType) });
+                val = uow.Database.ExecuteScalar<int?>("SELECT id FROM umbracoNode WHERE uniqueId=@id AND (nodeObjectType=@type OR nodeObjectType=@reservation)",
+                    new { id = key, type = GetNodeObjectTypeGuid(umbracoObjectType), reservation = Constants.ObjectTypes.IdReservationGuid });
                 uow.Commit();
             }
 
@@ -92,8 +92,8 @@ namespace Umbraco.Core.Services
             Guid? val;
             using (var uow = _uowProvider.GetUnitOfWork())
             {
-                val = uow.Database.ExecuteScalar<Guid?>("SELECT uniqueId FROM umbracoNode WHERE id=@id AND nodeObjectType=@nodeObjectType",
-                    new { id, nodeObjectType = GetNodeObjectTypeGuid(umbracoObjectType) });
+                val = uow.Database.ExecuteScalar<Guid?>("SELECT uniqueId FROM umbracoNode WHERE id=@id AND (nodeObjectType=@type OR nodeObjectType=@reservation)",
+                    new { id, type = GetNodeObjectTypeGuid(umbracoObjectType), reservation = Constants.ObjectTypes.IdReservationGuid });
                 uow.Commit();
             }
 
@@ -179,7 +179,7 @@ namespace Umbraco.Core.Services
         {
             private readonly T _id;
             private readonly UmbracoObjectTypes _umbracoObjectType;
-            
+
             public T Id
             {
                 get { return _id; }
diff --git a/src/Umbraco.Tests/Services/EntityServiceTests.cs b/src/Umbraco.Tests/Services/EntityServiceTests.cs
index 021c0d6c36..0dee46e07e 100644
--- a/src/Umbraco.Tests/Services/EntityServiceTests.cs
+++ b/src/Umbraco.Tests/Services/EntityServiceTests.cs
@@ -26,15 +26,15 @@ namespace Umbraco.Tests.Services
         public override void TearDown()
         {
             base.TearDown();
-        }      
+        }
 
         [Test]
         public void EntityService_Can_Get_Paged_Content_Children()
         {
-            
+
             var contentType = ServiceContext.ContentTypeService.GetContentType("umbTextpage");
-            
-            var root = MockedContent.CreateSimpleContent(contentType);            
+
+            var root = MockedContent.CreateSimpleContent(contentType);
             ServiceContext.ContentService.Save(root);
             for (int i = 0; i < 10; i++)
             {
@@ -45,7 +45,7 @@ namespace Umbraco.Tests.Services
             var service = ServiceContext.EntityService;
 
             long total;
-            var entities = service.GetPagedChildren(root.Id, UmbracoObjectTypes.Document, 0, 6, out total).ToArray();            
+            var entities = service.GetPagedChildren(root.Id, UmbracoObjectTypes.Document, 0, 6, out total).ToArray();
             Assert.That(entities.Length, Is.EqualTo(6));
             Assert.That(total, Is.EqualTo(10));
             entities = service.GetPagedChildren(root.Id, UmbracoObjectTypes.Document, 1, 6, out total).ToArray();
@@ -72,7 +72,7 @@ namespace Umbraco.Tests.Services
                     var c2 = MockedContent.CreateSimpleContent(contentType, Guid.NewGuid().ToString(), c1);
                     ServiceContext.ContentService.Save(c2);
                     count++;
-                }                
+                }
             }
 
             var service = ServiceContext.EntityService;
@@ -181,7 +181,7 @@ namespace Umbraco.Tests.Services
 
             var root = MockedContent.CreateSimpleContent(contentType);
             ServiceContext.ContentService.Save(root);
-            
+
             for (int i = 0; i < 10; i++)
             {
                 var c1 = MockedContent.CreateSimpleContent(contentType, "ssss" + Guid.NewGuid(), root);
@@ -204,7 +204,7 @@ namespace Umbraco.Tests.Services
             Assert.That(entities.Length, Is.EqualTo(50));
             Assert.That(total, Is.EqualTo(50));
         }
-       
+
         [Test]
         public void EntityService_Can_Get_Paged_Media_Children()
         {
@@ -227,7 +227,7 @@ namespace Umbraco.Tests.Services
             Assert.That(total, Is.EqualTo(10));
             entities = service.GetPagedChildren(root.Id, UmbracoObjectTypes.Media, 1, 6, out total).ToArray();
             Assert.That(entities.Length, Is.EqualTo(4));
-            Assert.That(total, Is.EqualTo(10));            
+            Assert.That(total, Is.EqualTo(10));
         }
 
         [Test]
@@ -362,7 +362,7 @@ namespace Umbraco.Tests.Services
 
             var root = MockedMedia.CreateMediaFolder(folderType, -1);
             ServiceContext.MediaService.Save(root);
-            
+
             for (int i = 0; i < 10; i++)
             {
                 var c1 = MockedMedia.CreateMediaImage(imageMediaType, root.Id);
@@ -519,7 +519,7 @@ namespace Umbraco.Tests.Services
             Assert.That(
                 entities.Any(
                     x =>
-                    x.AdditionalData.Any(y => y.Value is UmbracoEntity.EntityProperty 
+                    x.AdditionalData.Any(y => y.Value is UmbracoEntity.EntityProperty
                         && ((UmbracoEntity.EntityProperty)y.Value).PropertyEditorAlias == Constants.PropertyEditors.UploadFieldAlias)), Is.True);
         }
 
@@ -575,6 +575,30 @@ namespace Umbraco.Tests.Services
             Assert.IsFalse(result2.Success);
         }
 
+        [Test]
+        public void ReserveId()
+        {
+            var service = ServiceContext.EntityService;
+            var guid = Guid.NewGuid();
+
+            // can reserve
+            var reservedId = service.ReserveId(guid);
+            Assert.IsTrue(reservedId > 0);
+
+            // can get it back
+            var id = service.GetIdForKey(guid, UmbracoObjectTypes.DocumentType);
+            Assert.IsTrue(id.Success);
+            Assert.AreEqual(reservedId, id.Result);
+
+            // anything goes
+            id = service.GetIdForKey(guid, UmbracoObjectTypes.Media);
+            Assert.IsTrue(id.Success);
+            Assert.AreEqual(reservedId, id.Result);
+
+            // a random guid won't work
+            Assert.IsFalse(service.GetIdForKey(Guid.NewGuid(), UmbracoObjectTypes.DocumentType).Success);
+        }
+
         private static bool _isSetup = false;
 
         private int folderId;
@@ -589,7 +613,7 @@ namespace Umbraco.Tests.Services
 
                 //Create and Save folder-Media -> 1050
                 var folderMediaType = ServiceContext.ContentTypeService.GetMediaType(1031);
-                var folder = MockedMedia.CreateMediaFolder(folderMediaType, -1);                
+                var folder = MockedMedia.CreateMediaFolder(folderMediaType, -1);
                 ServiceContext.MediaService.Save(folder, 0);
                 folderId = folder.Id;
 
@@ -607,9 +631,9 @@ namespace Umbraco.Tests.Services
                 ServiceContext.MediaService.Save(subfolder, 0);
                 var subfolder2 = MockedMedia.CreateMediaFolder(folderMediaType, subfolder.Id);
                 ServiceContext.MediaService.Save(subfolder2, 0);
-                
+
             }
-            
+
         }
     }
 }
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