Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateTreatmentSettings.qml
===================================================================
diff -u -re50998d376110516b4d3c9c860b9cbb4f2013623 -r48b04367d9f229104e4048783df91089d0106379
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateTreatmentSettings.qml	(.../PreTreatmentCreateTreatmentSettings.qml)	(revision e50998d376110516b4d3c9c860b9cbb4f2013623)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateTreatmentSettings.qml	(.../PreTreatmentCreateTreatmentSettings.qml)	(revision 48b04367d9f229104e4048783df91089d0106379)
@@ -314,7 +314,7 @@
             text            : qsTr("Acid Concentrate")
 //            showEdit        : _root.editingEnabled // Hide 👋📋 TODO Phase 2
             onEditClicked   : _acidConcentrateAdjustment.open()
-            valid           : ! vTreatmentCreate.acidConcentrateConversionFactorRejectionReason
+            valid           : ! vTreatmentCreate.acidConcentrateConversionFactorRejectionReason && ! vTreatmentCreate.acidConcentrateIndexRejectionReason
 
             contentItem : BaseComboBox { id: _acidConcentrateComboBox
                 anchors.rightMargin : Variables.defaultMargin * 2
@@ -331,7 +331,8 @@
                 }
 
                 onActivated         : {
-                    if ( ! _acidConcentrate.valid ) { vTreatmentCreate.acidConcentrateConversionFactorRejectionReason = Variables.noRejectReason }
+                    if ( ! _acidConcentrate.valid ) {   vTreatmentCreate.acidConcentrateConversionFactorRejectionReason = Variables.noRejectReason
+                                                        vTreatmentCreate.acidConcentrateIndexRejectionReason            = Variables.noRejectReason }
                     vTreatmentCreate.acidConcentrate    = _acidConcentrateComboBox.currentIndex
                     vTreatmentCreate.acidConcentrateSet = true
                     vTreatmentCreate.acidConcentrateConversionFactor = vTreatmentRanges.acidConcentrateModel.get(vTreatmentCreate.acidConcentrate).value