Index: sources/gui/qml/pages/pretreatment/PreTreatmentStack.qml
===================================================================
diff -u -ref583f0056a0fb8c66a64e132be159719b2bc2f6 -r56381aae237db191956aff493907cd1f0801216b
--- sources/gui/qml/pages/pretreatment/PreTreatmentStack.qml	(.../PreTreatmentStack.qml)	(revision ef583f0056a0fb8c66a64e132be159719b2bc2f6)
+++ sources/gui/qml/pages/pretreatment/PreTreatmentStack.qml	(.../PreTreatmentStack.qml)	(revision 56381aae237db191956aff493907cd1f0801216b)
@@ -245,8 +245,9 @@
 
     // Slots
     Connections { target: vTDOpMode
-        function onPreTreatmentChanged( vValue ) {  if ( vSettings.advancedMode )   { page ( _pretreatmentInstallation      , vValue    )}
-                                                    else                            { page ( _pretreatmentConcentrates      , vValue    )}
+        function onPreTreatmentChanged( vValue ) {  if ( ! vTreatmentCreate.txCode )    { vTreatmentCreate.generateTxCode()                  }
+                                                    if ( vSettings.advancedMode )       { page ( _pretreatmentInstallation      , vValue    )}
+                                                    else                                { page ( _pretreatmentConcentrates      , vValue    )}
         }
     }