Index: sources/gui/qml/pages/pretreatment/PreTreatmentMainStack.qml
===================================================================
diff -u -r821bf955d0ba7e028bccfee7c04ca77cf80a0bd4 -r8a5dbf556a66524fbe4b60ac1573182a0bd27617
--- sources/gui/qml/pages/pretreatment/PreTreatmentMainStack.qml	(.../PreTreatmentMainStack.qml)	(revision 821bf955d0ba7e028bccfee7c04ca77cf80a0bd4)
+++ sources/gui/qml/pages/pretreatment/PreTreatmentMainStack.qml	(.../PreTreatmentMainStack.qml)	(revision 8a5dbf556a66524fbe4b60ac1573182a0bd27617)
@@ -30,6 +30,8 @@
 
     stackView.initialItem   : null
 
+    property int stackStepIndex : 0
+
     PreTreatmentWaterSampleStack{ id: _preTreatmentWaterSampleStack     }
     PreTreatmentConsumablesStack{ id: _preTreatmentConsumablesStack     }
     PreTreatmentDisposablesStack{ id: _preTreatmentDisposablesStack     }