--- a/src/order_gui.cpp	Mon Aug 27 16:28:33 2007 +0000
+++ b/src/order_gui.cpp	Sun Sep 02 11:58:58 2007 +0000
@@ -356,7 +356,7 @@
 	if (u->type != v->type) return false;
 
 	if (u->HasFront() && !u->IsPrimaryVehicle()) {
-		u = GetFirstVehicleInChain(u);
+		u = u->First();
 		if (!u->IsPrimaryVehicle()) return false;
 	}