--- a/eric7/Graphics/UMLClassDiagramBuilder.py	Fri May 21 17:54:15 2021 +0200
+++ b/eric7/Graphics/UMLClassDiagramBuilder.py	Fri May 21 18:01:11 2021 +0200
@@ -314,15 +314,6 @@
                     colors=self.umlView.getDrawingColors())
                 self.scene.addItem(assoc)
     
-    def getPersistenceData(self):
-        """
-        Public method to get a string for data to be persisted.
-        
-        @return persisted data string
-        @rtype str
-        """
-        return "file={0}, no_attributes={1}".format(self.file, self.noAttrs)
-    
     def parsePersistenceData(self, version, data):
         """
         Public method to parse persisted data.