diff --git a/addons/account_greek_fiscal/__init__.py b/addons/account_greek_fiscal/__init__.py
index 8009cace3c2..0975d02fea4 100644
--- a/addons/account_greek_fiscal/__init__.py
+++ b/addons/account_greek_fiscal/__init__.py
@@ -21,6 +21,7 @@
 ##############################################################################
 
 import fiscal_prints
+import account_invoice_print
 
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
 
diff --git a/addons/account_greek_fiscal/account_invoice_print.py b/addons/account_greek_fiscal/account_invoice_print.py
new file mode 100644
index 00000000000..bf2754ef9cf
--- /dev/null
+++ b/addons/account_greek_fiscal/account_invoice_print.py
@@ -0,0 +1,48 @@
+# -*- encoding: utf-8 -*-
+##############################################################################
+#
+#    OpenERP, Open Source Management Solution	
+#    Copyright (C) 2004-2008 Tiny SPRL (<http://tiny.be>). All Rights Reserved
+#    $Id$
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from osv import fields, osv
+
+class account_invoice(osv.osv):
+    _inherit = "account.invoice"
+    _columns = {
+        # states={'open':[('readonly',False)]}
+        'fiscalgr_print': fields.many2one('account.fiscalgr.print','Fiscal print', readonly=True, ),
+        }
+    def copy(self, cr, uid, id, default=None, context=None):
+        if default is None:
+            default = {}
+        default = default.copy()
+        default.update({'fiscalgr_print':None,})
+        return super(account_invoice, self).copy(cr, uid, id, default, context)
+
+    def action_cancel(self, cr, uid, ids, *args):
+        #account_move_obj = self.pool.get('account.move')
+        invoices = self.read(cr, uid, ids, ['fiscalgr_print'])
+        for i in invoices:
+            if i['fiscalgr_print']:
+	    	raise osv.except_osv(_('Invalid action !'), _('Cannot cancel invoice(s) which are already printed !'))
+        return super(account_invoice,self).action_cancel(cr,uid,ids,args)
+
+account_invoice()
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+