diff --git a/src/sas/qtgui/Plotting/Plotter.py b/src/sas/qtgui/Plotting/Plotter.py
index 998baac4ee..4137c95ae5 100644
--- a/src/sas/qtgui/Plotting/Plotter.py
+++ b/src/sas/qtgui/Plotting/Plotter.py
@@ -78,21 +78,12 @@ def data(self):
     @data.setter
     def data(self, value):
         """ data setter """
-        #self._data = value
-        self._data.append(value)
-        if value._xunit:
-            self.xLabel = "%s(%s)"%(value._xaxis, value._xunit)
+        data_names = [item.name for item in self._data]
+        if value.name in data_names:
+            data_index = data_names.index(value.name)
+            self._data[data_index] = value
         else:
-            self.xLabel = "%s"%(value._xaxis)
-        if value._yunit:
-            self.yLabel = "%s(%s)"%(value._yaxis, value._yunit)
-        else:
-            self.yLabel = "%s"%(value._yaxis)
-
-        if value.scale == 'linear' or value.isSesans:
-            self.xscale = 'linear'
-            self.yscale = 'linear'
-        self.title(title=value.name)
+            self._data.append(value)
 
     def plot(self, data=None, color=None, marker=None, hide_error=False, transform=True):
         """
@@ -105,7 +96,7 @@ def plot(self, data=None, color=None, marker=None, hide_error=False, transform=T
 
         # Data1D
         if isinstance(data, Data1D):
-            self.data.append(data)
+            self.data = data
 
         is_fit = (data.id=="fit")
 
diff --git a/src/sas/qtgui/Plotting/UnitTesting/PlotterTest.py b/src/sas/qtgui/Plotting/UnitTesting/PlotterTest.py
index d70bc7d134..baa67805c4 100644
--- a/src/sas/qtgui/Plotting/UnitTesting/PlotterTest.py
+++ b/src/sas/qtgui/Plotting/UnitTesting/PlotterTest.py
@@ -44,15 +44,6 @@ def workspace(self):
 
         yield p
 
-    def testDataProperty(self, plotter):
-        """ Adding data """
-        plotter.data = self.data
-
-        assert plotter.data[0] == self.data
-        assert plotter._title == self.data.name
-        assert plotter.xLabel == ""
-        assert plotter.yLabel == ""
-
     def testPlotWithErrors(self, plotter, mocker):
         """ Look at the plotting with error bars"""
         plotter.data = self.data