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/Data/InventoryData.cs

@@ -201,6 +201,12 @@ namespace OpenSim.Framework.Data
         /// <param name="item">The updated item</param>
         void updateInventoryItem(InventoryItemBase item);
 
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="item"></param>
+        void deleteInventoryItem(InventoryItemBase item);
+
         /// <summary>
         /// Adds a new folder specified by folder
         /// </summary>