basic vehicle correction

ttcn/CAM/LibItsCam_Templates.ttcn

@@ -71,14 +71,10 @@ module LibItsCam_Templates {
 		cam := {
 			stationCharacteristics := {true, false, true},
 			camParameters := {
-				vehicle := {
-					profileDependent := {
-						basicVehicle := NULL
-					}
-				}
+				vehicle := {profileDependent := {basicVehicle := ?}}
 			}
 		}
-	};
+	}
 
 	template CamPdu mw_camMsg_emergencyVehicle modifies mw_camMsg_anyVehicle := {
 		cam := {