Index: sources/gui/qml/components/BaseComboBox.qml
===================================================================
diff -u -r1132f049e169cc87a059261f72fca0ceb7d739f1 -rec53ffe0a1528ace958cfe347875b7bcd25bed57
--- sources/gui/qml/components/BaseComboBox.qml	(.../BaseComboBox.qml)	(revision 1132f049e169cc87a059261f72fca0ceb7d739f1)
+++ sources/gui/qml/components/BaseComboBox.qml	(.../BaseComboBox.qml)	(revision ec53ffe0a1528ace958cfe347875b7bcd25bed57)
@@ -30,6 +30,7 @@
     property int  delegateHeight    : height
     property bool   canOff          : false
     property bool centerHorizontally: false
+    property var itemsEnabled       : Array(_root.count).fill(true)
 
     width                   : 300
     displayText             : _root.isActive ? currentText : Variables.emptyEntry
@@ -61,10 +62,11 @@
         width       : _root.delegateWidth
         height      : _root.delegateHeight
         highlighted : _root.highlightedIndex === index
+        enabled     : _root.itemsEnabled[index]
 
         contentItem: Text {
             text                : canOff && modelData === "0" ? qsTr("OFF") :  modelData
-            color               : Colors.offWhite
+            color               : enabled ? Colors.offWhite : Colors.textDisableButton
             font                : _root.font
             verticalAlignment   : Text.AlignVCenter
             horizontalAlignment : centerHorizontally ? Text.AlignHCenter : undefined
Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreatePatientPrescription.qml
===================================================================
diff -u -r456da384df52c20ce45b2bec4317806ee11af1f6 -rec53ffe0a1528ace958cfe347875b7bcd25bed57
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreatePatientPrescription.qml	(.../PreTreatmentCreatePatientPrescription.qml)	(revision 456da384df52c20ce45b2bec4317806ee11af1f6)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreatePatientPrescription.qml	(.../PreTreatmentCreatePatientPrescription.qml)	(revision ec53ffe0a1528ace958cfe347875b7bcd25bed57)
@@ -12,8 +12,9 @@
     readonly property int cellWidth         : Variables.createRxLabelUnitContainerWidth
     readonly property int cellHeight        : Variables.createRxLabelUnitContainerHeight
     readonly property bool heparinFeatured  : vSettings.heparinSyringePump
-    property bool isHDFFeatured             : vTreatmentCreate.treatmentModality === HeaderBar.Mode_HDF
-    property bool isHeparinOn               :  _heparinRxControl.value === PreTreatmentCreatePatientPrescription.ON
+    property bool isHDFFeatured             : vTreatmentCreate.treatmentModality === HeaderBar.Mode_HDF ||
+                                              vTreatmentCreate.treatmentModality === HeaderBar.Mode_HD_Online_Fluid
+    property bool isHeparinOn               : _heparinRxControl.value === PreTreatmentCreatePatientPrescription.ON
 
     property bool editingEnabled            : true
     property int columnSpacing              : 15
@@ -154,6 +155,9 @@
                 currentIndex        : vTreatmentCreate.treatmentModality
                 model               : vTreatmentRanges.treatmentModalityOptions
                 centerHorizontally  : true
+                itemsEnabled        : [ vTreatmentCreate.treatmentModality === HeaderBar.Mode_HD    ,   // Mode_HD
+                                        vTreatmentCreate.treatmentModality !== HeaderBar.Mode_HD    ,   // Mode_HDF
+                                        vTreatmentCreate.treatmentModality !== HeaderBar.Mode_HD    ]   // Mode_HD_Online_Fluid
 
                 onActivated         : {
                     if ( ! _treatmentModality.valid ) { vTreatmentCreate.treatmentModalityRejectReason = Variables.noRejectReason }