diff --git a/src/include/isam.cpp b/src/include/isam.cpp
index 2b6a21020..8af59c191 100755
--- a/src/include/isam.cpp
+++ b/src/include/isam.cpp
@@ -712,6 +712,20 @@ TBaseisamfile::TBaseisamfile(
 
 }
 
+TBaseisamfile::TBaseisamfile(
+	const char* name,     // @parm Nome del file esterno da aprire
+	const TTrec & desc) // @parm Indica la descrizione del file
+{
+	const int err = DB_build(name, &desc.rec());
+	if (err != NOERR)
+		fatal_box("Non posso creare il file %s : errore n.ro %d", name, err);
+	_lasterr = NOERR;
+	TFilename filename(name);
+	CHECK(filename.full(), "Must define the file to open!");
+	_logicnum = prefix().get_handle(filename);
+	_current = new TRectype(this);
+}
+
 TBaseisamfile::~TBaseisamfile()
 {
 	SAFE_DELETE(_current);
@@ -941,7 +955,7 @@ int TBaseisamfile::_write(const TRectype& rec)
   { 
 		if (rec.has_memo())
       ((TRectype&)rec).write_memo(_isam_handle, _recno );
-		rec_cache(_logicnum).notify_change();
+			rec_cache(_logicnum).notify_change();
 
   }
   else
@@ -1089,7 +1103,7 @@ int TBaseisamfile::_remove(const TRectype& rec)
     {
       if (curr().has_memo( ))
         curr().init_memo();
-      rec_cache(_logicnum).notify_change();
+	      rec_cache(_logicnum).notify_change();
       DB_flush(fhnd);
     }
     else
@@ -1372,6 +1386,13 @@ TLocalisamfile::TLocalisamfile(
 {
 }
 
+TLocalisamfile::TLocalisamfile(
+	const char* name,     // @parm Nome del file esterno da aprire
+	const TTrec & desc) // @parm Indica la descrizione del file
+	: TBaseisamfile(name, desc)
+{
+}
+
 TLocalisamfile::TLocalisamfile(int logicnum, bool tmpfile)
               : TBaseisamfile(logicnum)
 {
@@ -1475,6 +1496,19 @@ TIsamtempfile::TIsamtempfile(int logicnum, const char* radix, bool create, bool
   n.insert("%", 0);
 
   open(n, create, eod, eox);
+
+	TCodeb_handle cb_handle = prefix().get_handle(_isam_handle, _curr_key);
+	const int dbfreclen = DB_reclen(cb_handle);
+	const int trcreclen = prefix().get_reclen(logicnum);
+
+	if (dbfreclen != trcreclen)
+	{
+		TString msg;
+		msg.format("Lunghezza record incoerente sul file %d (%s): file=%d trc=%d",
+			num(), (const char*)description(), dbfreclen, trcreclen);
+		fatal_box(msg);
+	}
+
 }
 
 TIsamtempfile::~TIsamtempfile()
@@ -1615,17 +1649,23 @@ int TIsamtempfile::close()
 // TExternisamfile
 ///////////////////////////////////////////////////////////
 TExternisamfile::TExternisamfile(const char* name, bool exclusive, bool index)
-: TLocalisamfile(name) 
+                : TLocalisamfile(name) 
 {
   init(name, exclusive, index);                             
 }
 
 TExternisamfile::TExternisamfile(const char* name, const char* descname, bool exclusive, bool index)
-: TLocalisamfile(name, descname)
+                : TLocalisamfile(name, descname)
 {
   init(name, exclusive, index);                             
 }
 
+TExternisamfile::TExternisamfile(const char* name, const TTrec & desc, bool exclusive, bool index)
+	              : TLocalisamfile(name, desc) 
+{
+	init(name, exclusive, index);
+}
+
 TExternisamfile::~TExternisamfile()
 {
   close();
@@ -4035,7 +4075,7 @@ TRectype& TRectype::operator =(const char* rec)
 
 const char* TRectype::key(int numkey) const
 {
-	TString& tmp = get_tmp_string(256);
+  TString& tmp = get_tmp_string(256);
   __build_key(rec_des(), numkey, _rec, tmp.get_buffer(), false);
   return tmp;
 }
@@ -4153,7 +4193,7 @@ bool TRectype::edit(int logicnum, const char* alternate_key_fields, const char*
 
     xvt_fsys_remove_file(ininame);
 
-    if (ok)
+    if (ok && _logicnum < 1000)
       rec_cache(logicnum).notify_change();
   }      
   return ok;
@@ -4378,7 +4418,7 @@ const char* TRecfield::operator =(const char* s)
 			_rec->put(_name, s);
 	  else
 			__putfieldbuff( _len, _dec, _type, s, _p);
-	}
+		}
 	else
 		put_subfield(s);
   _rec->setempty(FALSE);
diff --git a/src/include/isam.h b/src/include/isam.h
index 2999cb90f..08932f11d 100755
--- a/src/include/isam.h
+++ b/src/include/isam.h
@@ -1,4 +1,4 @@
-+#ifndef __ISAM_H
+#ifndef __ISAM_H
 #define __ISAM_H
 
 #ifndef __CURRENCY_H
@@ -430,6 +430,8 @@ protected:
 
   // @cmember Costruttore per derivare TExternisamfile. <p Name> indica il file esterno da aprire.
   TBaseisamfile(const char* name, const char* descname = NULL);
+	// @cmember Costruttore per derivare TExternisamfile. <p Name> indica il file esterno da aprire.
+	TBaseisamfile(const char* name, const TTrec & desc);
 
   int handle(int key = 0) const;
 
@@ -756,6 +758,8 @@ protected:
   TLocalisamfile(int logicnum, bool tmp);
   // @cmember Costruttore per derivare TExternisamfile. <p Name> indica il file esterno da aprire (vedi <c TBaseisamfile>).
   TLocalisamfile(const char* name, const char* descname = NULL);
+	// @cmember Costruttore per derivare TExternisamfile. <p Name> indica il file esterno da aprire (vedi <c TBaseisamfile>)
+	TLocalisamfile(const char* name, const TTrec & desc);
 
 // @access Public Member
 public:
@@ -857,8 +861,8 @@ public:
   // @cmember Costruttore. <p descname> é il nome del file che contiene la descrizione del file (estensione trr).
   //                       <p exclusive> indica se aprire il file in modo esclusivo.
   //                       <p index> indica se aprire il file con indici o meno
-  TExternisamfile(const char* name, const char * descname, bool exclusive = false,
-                  bool index = true);
+  TExternisamfile(const char* name, const char * descname, bool exclusive = false, bool index = true);
+	TExternisamfile(const char* name, const TTrec &desc, bool exclusive = false, bool index = true);
   // @cmember Distruttore
   virtual ~TExternisamfile();
 };