diff --git a/OpenSim/Region/Framework/Interfaces/IEntityInventory.cs b/OpenSim/Region/Framework/Interfaces/IEntityInventory.cs
index 2b90960936..fd43923cb3 100644
--- a/OpenSim/Region/Framework/Interfaces/IEntityInventory.cs
+++ b/OpenSim/Region/Framework/Interfaces/IEntityInventory.cs
@@ -161,6 +161,7 @@ namespace OpenSim.Region.Framework.Interfaces
         /// in this prim's inventory.</param>
         /// <returns>false if the item did not exist, true if the update occurred successfully</returns>
         bool UpdateInventoryItem(TaskInventoryItem item);
+        bool UpdateInventoryItem(TaskInventoryItem item, bool fireScriptEvents);
 
         /// <summary>
         /// Remove an item from this entity's inventory
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
index 3b1b567557..44c49c58e4 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPartInventory.cs
@@ -609,30 +609,37 @@ namespace OpenSim.Region.Framework.Scenes
         /// <returns>false if the item did not exist, true if the update occurred successfully</returns>
         public bool UpdateInventoryItem(TaskInventoryItem item)
         {
-            lock (m_items)
+            return UpdateInventoryItem(item, true);
+        }
+
+        public bool UpdateInventoryItem(TaskInventoryItem item, bool fireScriptEvents)
+        {
+            lock(m_items)
             {
                 if (m_items.ContainsKey(item.ItemID))
                 {
-                    item.ParentID = m_part.UUID;
-                    item.ParentPartID = m_part.UUID;
-                    item.Flags = m_items[item.ItemID].Flags;
-
-                    // If group permissions have been set on, check that the groupID is up to date in case it has
-                    // changed since permissions were last set.
-                    if (item.GroupPermissions != (uint)PermissionMask.None)
-                        item.GroupID = m_part.GroupID;
-                    
-                    if (item.AssetID == UUID.Zero)
+                    if (m_items.ContainsKey(item.ItemID))
                     {
-                        item.AssetID = m_items[item.ItemID].AssetID;
-                    }
+                        item.ParentID = m_part.UUID;
+                        item.ParentPartID = m_part.UUID;
+                        item.Flags = m_items[item.ItemID].Flags;
 
+                        // If group permissions have been set on, check that the groupID is up to date in case it has
+                        // changed since permissions were last set.
+                        if (item.GroupPermissions != (uint)PermissionMask.None)
+                            item.GroupID = m_part.GroupID;
+                        
+                        if (item.AssetID == UUID.Zero)
+                        {
+                            item.AssetID = m_items[item.ItemID].AssetID;
+                        }
                     m_items[item.ItemID] = item;
                     m_inventorySerial++;
-                    m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
+                    if (fireScriptEvents)
+                        m_part.TriggerScriptChangedEvent(Changed.INVENTORY);
                     HasInventoryChanged = true;
                     m_part.ParentGroup.HasGroupChanged = true;
-
+                    m_items.LockItemsForWrite(false);
                     return true;
                 }
                 else
@@ -643,9 +650,9 @@ namespace OpenSim.Region.Framework.Scenes
                         item.ItemID, m_part.Name, m_part.UUID, 
                         m_part.AbsolutePosition, m_part.ParentGroup.Scene.RegionInfo.RegionName);
                 }
-            }
 
-            return false;
+                return false;
+            }
         }
 
         /// <summary>