diff --git a/lv/lv3100.cpp b/lv/lv3100.cpp
index 85c090453..95c03f49a 100755
--- a/lv/lv3100.cpp
+++ b/lv/lv3100.cpp
@@ -195,6 +195,9 @@ inline TGestione_bolle_app& gbapp() { return (TGestione_bolle_app &)main_app();
 //Definizione della classe della maschera
 class TGestione_bolle_msk : public TDocumento_mask
 {
+  long    _stcodcf;
+  long    _stcodcont;
+
 protected:  
   static void arrotonda(const TMask& msk, real& quantita);  
 //hanlder di documento:
@@ -208,6 +211,7 @@ protected:
 public:
   virtual void user_set_handler( short fieldid, int index);
   virtual void user_set_row_handler(TMask& rm, short field, int index);
+  void reset_var_mask() {_stcodcf = 0; _stcodcont = 0;}
   TGestione_bolle_msk(const char* tipodoc);
 };
 
@@ -269,15 +273,13 @@ bool TGestione_bolle_msk::lv_bolla_handler(TMask_field& f, KEY k)
   case F_DATADOC: ok = data_hndl( f, k ); break;
   default: break;
   }
-  TDocumento_mask& dmsk = (TDocumento_mask&)f.mask();
+  TGestione_bolle_msk& dmsk = (TGestione_bolle_msk&)f.mask();
   
   if (ok && k == K_TAB && ((dmsk.insert_mode() && f.to_check(k, true)) || f.focusdirty()))
   {    
     f.set_focusdirty(false);
     
     TDocumento& doc = dmsk.doc();
-
-    static long stcodcf = 0, stcodcont = 0;
     
     TSheet_field& sheet = dmsk.sfield(F_SHEET);
     int nrighe = sheet.items();
@@ -299,13 +301,13 @@ bool TGestione_bolle_msk::lv_bolla_handler(TMask_field& f, KEY k)
       return true;
     }
 
-    if (stcodcf == codcf && stcodcont == codcont && nrighe > 0)
+    if (dmsk._stcodcf == codcf && dmsk._stcodcont == codcont && nrighe > 0)
       return true;  
     
     dmsk.mask2doc();  
 
-    stcodcf = codcf;
-    stcodcont = codcont;
+    dmsk._stcodcf = codcf;
+    dmsk._stcodcont = codcont;
 
     //elimino tutte le righe del documento
     doc.destroy_rows(); 
@@ -685,10 +687,12 @@ int TGestione_bolle_app::read(TMask& m)
 //ridefinisco il metodo init_insert_mode della TMotore_application
 void TGestione_bolle_app::init_insert_mode(TMask &m)
 {
-  TDocumento_mask& mask = (TDocumento_mask&) m;
+  TGestione_bolle_msk& mask = (TGestione_bolle_msk&) m;
   TDocumento& d = mask.doc();
   _giac.reset(d);
 
+  mask.reset_var_mask();
+
   return TMotore_application::init_insert_mode(m);
 }