diff --git a/src/Mod/TechDraw/Gui/TaskProjGroup.cpp b/src/Mod/TechDraw/Gui/TaskProjGroup.cpp
index 72aed5b41a..f09d0e5cda 100644
--- a/src/Mod/TechDraw/Gui/TaskProjGroup.cpp
+++ b/src/Mod/TechDraw/Gui/TaskProjGroup.cpp
@@ -72,6 +72,16 @@ TaskProjGroup::TaskProjGroup(TechDraw::DrawProjGroup* featView, bool mode) :
 
     setFractionalScale(multiView->getScale());
     ui->cmbScaleType->setCurrentIndex(multiView->ScaleType.getValue());
+	
+	//Allow or prevent scale changing initially 
+	if (multiView->ScaleType.isValue("Custom"))	{
+		ui->sbScaleNum->setEnabled(true);
+		ui->sbScaleDen->setEnabled(true);
+	}
+	else {
+		ui->sbScaleNum->setEnabled(false);
+		ui->sbScaleDen->setEnabled(false);
+	}
 
     // Initially toggle view checkboxes if needed
     setupViewCheckboxes(true);
@@ -229,6 +239,10 @@ void TaskProjGroup::scaleTypeChanged(int index)
     if(blockUpdate)
         return;
 
+	//defaults to prevent scale changing 
+	ui->sbScaleNum->setEnabled(false);
+	ui->sbScaleDen->setEnabled(false);
+
     if(index == 0) {
         // Document Scale Type
         Gui::Command::doCommand(Gui::Command::Doc, "App.activeDocument().%s.ScaleType = '%s'", multiView->getNameInDocument()
@@ -241,6 +255,9 @@ void TaskProjGroup::scaleTypeChanged(int index)
         // Custom Scale Type
         Gui::Command::doCommand(Gui::Command::Doc, "App.activeDocument().%s.ScaleType = '%s'", multiView->getNameInDocument()
                                                                                              , "Custom");
+		ui->sbScaleNum->setEnabled(true);
+		ui->sbScaleDen->setEnabled(true);
+
         int a = ui->sbScaleNum->value();
         int b = ui->sbScaleDen->value();
         double scale = (double) a / (double) b;