Taking Prims (SceneObjectGroups) in and out of inventory should now work and if left in inventory will still be there after restarts. (as with the rest of inventory it will only fully work in standalone mode with account authentication turned on).

OpenSim/Framework/InventoryServiceBase/InventoryServiceBase.cs

@@ -124,6 +124,14 @@ namespace OpenSim.Framework.InventoryServiceBase
             }
         }
 
+        public void deleteItem(InventoryItemBase item)
+        {
+            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            {
+                plugin.Value.deleteInventoryItem(item);
+            }
+        }
+
         /// <summary>
         /// 
         /// </summary>