diff --git a/ci/ci0400.cpp b/ci/ci0400.cpp
index 60fc8db47..4cc73ed9c 100755
--- a/ci/ci0400.cpp
+++ b/ci/ci0400.cpp
@@ -157,7 +157,7 @@ void TImmissioneDocumenti_mask::next_page(int p)
 	enable(DLG_DELREC, del_closed()[k]);
 }
 
-void TImmissioneDocumenti_mask::open_day_mask(conat TDate & date)
+void TImmissioneDocumenti_mask::open_day_mask(const TDate & date)
 {
 	TDate d(date);
 
@@ -261,7 +261,7 @@ void TImmissioneDocumenti_mask::update_current_calendar(int year)
 	almanac().force_update();
 }
 
-void TImmissioneDocumenti_mask::call_ve0(int exitval, TRelation& relation, TDate& date, const TString& codnum, const TString& doctype, byte currpage)
+void TImmissioneDocumenti_mask::call_ve0(int exitval, TRelation& relation, const TDate& date, const TString& codnum, const TString& doctype, byte currpage)
 {
   TFilename tempfile;
   tempfile.temp("", "ini");
diff --git a/ci/ci0400.h b/ci/ci0400.h
index 024cb7bce..ea9d4af7e 100755
--- a/ci/ci0400.h
+++ b/ci/ci0400.h
@@ -62,7 +62,7 @@ public:
 
 private:
 // chiamata del programma ve0
-  void call_ve0(int exitval, TRelation& relation, TDate& date, const TString& codnum, const TString& doctype = EMPTY_STRING, byte currpage = 0);
+  void call_ve0(int exitval, TRelation& relation, const TDate& date, const TString& codnum, const TString& doctype = EMPTY_STRING, byte currpage = 0);
 
 public:
 // Costruttore
diff --git a/ci/cilib.h b/ci/cilib.h
index 6f8913d06..e39bbfd45 100755
--- a/ci/cilib.h
+++ b/ci/cilib.h
@@ -109,7 +109,7 @@ public:
   bool is_date_void(int currpage, TDate& cdate);
   // @cmember Gestione selezione: Setta la prima data dell'anno con l'inserimento attivo
 	void set_insert_date(const TDate & d) { _dateinsert = d; }
-	bool can_insert(TDate &d) const { return d >= _dateinsert; }
+	bool can_insert(const TDate &d) const { return d >= _dateinsert; }
 
   // @access Public Member
 public: