Index: /trunk/src/VBox/Main/MachineImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/MachineImpl.cpp	(revision 22761)
+++ /trunk/src/VBox/Main/MachineImpl.cpp	(revision 22762)
@@ -3118,7 +3118,4 @@
             HWData::GuestProperty property;
             property.mFlags = NILFLAG;
-            if (fFlags & TRANSIENT)
-                rc = setError(VBOX_E_INVALID_OBJECT_STATE,
-                              tr("Cannot set a transient property when the machine is not running"));
 
             if (SUCCEEDED(rc))