diff --git a/cg/cg2104.cpp b/cg/cg2104.cpp
index 4455140b8..3c1ffddd6 100755
--- a/cg/cg2104.cpp
+++ b/cg/cg2104.cpp
@@ -72,7 +72,12 @@ bool TPrimanota_application::pag_notify(TSheet_field& ps, int r, KEY k)
       mod = m_tipo = m_ulc = TRUE;      
     
     if (newu != ts.get(5))  // modificata ulteriore classificazione
-      mod = m_ulc  = TRUE;      
+      mod = m_ulc  = TRUE;
+    else if (m_tipo) {
+      m_ulc = TRUE;
+      newu = "";
+    }
+          
     break;
   case K_DEL: 
     doit = !recalc;