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-rw-r--r--src/script/api/script_order.cpp1
-rw-r--r--src/script/api/script_order.hpp1
2 files changed, 2 insertions, 0 deletions
diff --git a/src/script/api/script_order.cpp b/src/script/api/script_order.cpp
index 8b55cabb4..3087caa65 100644
--- a/src/script/api/script_order.cpp
+++ b/src/script/api/script_order.cpp
@@ -627,6 +627,7 @@ static void _DoCommandReturnSetOrderFlags(class ScriptInstance *instance)
EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position_move));
EnforcePrecondition(false, IsValidVehicleOrder(vehicle_id, order_position_target));
+ EnforcePrecondition(false, order_position_move != order_position_target);
int order_pos_move = ScriptOrderPositionToRealOrderPosition(vehicle_id, order_position_move);
int order_pos_target = ScriptOrderPositionToRealOrderPosition(vehicle_id, order_position_target);
diff --git a/src/script/api/script_order.hpp b/src/script/api/script_order.hpp
index 68702afdb..63089a2bd 100644
--- a/src/script/api/script_order.hpp
+++ b/src/script/api/script_order.hpp
@@ -524,6 +524,7 @@ public:
* @param order_position_target The target order
* @pre IsValidVehicleOrder(vehicle_id, order_position_move).
* @pre IsValidVehicleOrder(vehicle_id, order_position_target).
+ * @pre order_position_move != order_position_target.
* @exception ScriptError::ERR_OWNED_BY_ANOTHER_COMPANY
* @return True if and only if the order was moved.
* @note If the order is moved to a lower place (e.g. from 7 to 2)