diff --git a/at/at1500.cpp b/at/at1500.cpp
index aace39020..27b32f107 100755
--- a/at/at1500.cpp
+++ b/at/at1500.cpp
@@ -163,7 +163,7 @@ void TControlloBenemerenze::set_page(int file, int cnt)
 
 bool TControlloBenemerenze::filter_func_ctrlben(const TRelation* rel)
 {   
-	bool filtrato = FALSE;
+	bool filtrato = false;
 	TLocalisamfile& sog = rel->lfile();
 	// filtro per categorie donatori
 	TAssoc_array& categorie = app()._catdon;
@@ -174,14 +174,14 @@ bool TControlloBenemerenze::filter_func_ctrlben(const TRelation* rel)
 	}	
 	// se non ho selezionato categorie il soggetto va filtrato comunque
 	if (app()._catdon.items() == 0)
-		filtrato = TRUE;
+		filtrato = true;
 	// filtro per iniziale cognome		
 	if (filtrato && (!app()._lettini.blank()) && (!app()._lettfin.blank()))
 	{
 		TString80 cognome = sog.get(SOG_COGNOME);
 		TString16 primalett = cognome.left(15);
 		if (!(primalett >= app()._lettini && primalett <= app()._lettfin))
-			filtrato = FALSE;
+			filtrato = false;
 	}		
   return filtrato;
 }
@@ -219,7 +219,10 @@ bool TControlloBenemerenze::preprocess_page(int file, int counter)
 	TRectype* key = new TRectype(LF_BENEM);
 	key->put(BEN_CODICE,codice);
 	const int err = _sbenemerenze->read(key);
-	for (int r=1; r<=_sbenemerenze->rows(); r++)
+	const int items = _sbenemerenze->rows();
+	if (items <= 0)
+		return false;
+	for (int r=1; r<=items; r++)
 	{
 		const TRectype& riga = _sbenemerenze->row(r);
 		const TString16 tipoben = riga.get(BEN_TIPOBEN);
@@ -265,7 +268,7 @@ bool TControlloBenemerenze::preprocess_page(int file, int counter)
 	if (printer().rows_left()<2)
 		printer().formfeed();
 	_contatore++;
-  return TRUE;
+  return true;
 }
 
 bool TControlloBenemerenze::set_print(int m)
@@ -312,7 +315,7 @@ bool TControlloBenemerenze::set_print(int m)
 	  if (sotfin.not_empty())
 			a.put(SOG_CODSOT, sotfin);
 		current_cursor()->setregion(da, a);
-		current_cursor()->setfilter(filtro, TRUE);
+		current_cursor()->setfilter(filtro, true);
 		((TSorted_cursor*)current_cursor())->change_order(chiave);
     reset_files(); 
     add_file(LF_SOGGETTI);
@@ -339,10 +342,10 @@ bool TControlloBenemerenze::set_print(int m)
 		reset_print();
 		printer().footerlen(0);		
     crea_intestazione();
-    return TRUE;
+    return true;
   }
   else
-    return FALSE;
+    return false;
 }
 
 void TControlloBenemerenze::crea_intestazione()
@@ -379,7 +382,7 @@ bool TControlloBenemerenze::user_create()
 	_colonne = new TAssoc_array();
 	add_cursor(new TSorted_cursor(_rel,"SOG_CODSEZ","",3));
   _msk = new TMask("at1500a");
-  return TRUE;
+  return true;
 }
 
 bool TControlloBenemerenze::user_destroy()
@@ -389,7 +392,7 @@ bool TControlloBenemerenze::user_destroy()
   delete _sbenemerenze;
   delete _benem;
   delete _rel;
-  return TRUE;
+  return true;
 }
 
 int at1500(int argc, char* argv[])