/// <summary>
        /// Check if two IFCPresentationLayerAssignments are equivalent, and warn if they aren't/
        /// </summary>
        /// <param name="originalAssignment">The original layer assignment in this representation.</param>
        /// <param name="layerAssignment">The layer assignment to add to this representation.</param>
        /// <returns>True if the layer assignments are consistent; false otherwise.</returns>
        static public bool CheckLayerAssignmentConsistency(IFCPresentationLayerAssignment originalAssignment, 
            IFCPresentationLayerAssignment layerAssignment, int id)
        {
            if ((originalAssignment != null) && (!originalAssignment.IsEquivalentTo(layerAssignment)))
            {
                Importer.TheLog.LogWarning(id, "Multiple inconsistent layer assignment items found for this item; using first one.", false);
                return false;
            }

            return true;
        }