diff --git a/GUI/Model/Descriptor/SpanProperty.cpp b/GUI/Model/Descriptor/SpanProperty.cpp
index 0ff00e49556a9873c617299fa688f3515f0619b2..cf135d9ecae3abc16e70f4ecbeac065e9a2cc092 100644
--- a/GUI/Model/Descriptor/SpanProperty.cpp
+++ b/GUI/Model/Descriptor/SpanProperty.cpp
@@ -22,7 +22,9 @@ namespace Tag {
 const QString Nbins("Nbins");
 const QString Width("Width");
 const QString Center("Center");
-const QString ExpandGroupbox("ExpandGroupbox"); // obsolete since v22.0
+const QString Min("Min"); // from AxisProperty pre v22
+const QString Max("Max"); // from AxisProperty pre v22
+const QString ExpandGroupbox("ExpandGroupbox"); // from AxisProperty pre v22
 
 } // namespace Tag
 } // namespace
@@ -48,7 +50,7 @@ Scale SpanProperty::createAxis(const std::string& name) const
 
 void SpanProperty::writeTo(QXmlStreamWriter* w) const
 {
-    XML::writeAttribute(w, XML::Attrib::version, uint(2));
+    XML::writeAttribute(w, XML::Attrib::version, uint(3)); // forked from AxesProperty v3
 
     // nbins
     w->writeStartElement(Tag::Nbins);