diff --git a/account_statement_base_import/parser/file_parser.py b/account_statement_base_import/parser/file_parser.py
index 139d3721..f3bd76b6 100644
--- a/account_statement_base_import/parser/file_parser.py
+++ b/account_statement_base_import/parser/file_parser.py
@@ -17,8 +17,8 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 ##############################################################################
-
 from openerp.tools.translate import _
+from openerp.osv.osv import except_osv
 import tempfile
 import datetime
 from parser import BankStatementImportParser
@@ -34,7 +34,8 @@ class FileParser(BankStatementImportParser):
     Generic abstract class for defining parser for .csv or .xls file format.
     """
 
-    def __init__(self, parse_name, keys_to_validate=[], ftype='csv', convertion_dict=None, header=None, *args, **kwargs):
+    def __init__(self, parse_name, keys_to_validate=[], ftype='csv', convertion_dict=None,
+                 header=None, *args, **kwargs):
         """
             :param char: parse_name : The name of the parser
             :param list: keys_to_validate : contain the key that need to be present in the file
@@ -54,7 +55,8 @@ class FileParser(BankStatementImportParser):
         if ftype in ('csv', 'xls'):
             self.ftype = ftype
         else:
-            raise Exception(_('Invalide file type %s. please use csv or xls') % (ftype))
+            raise except_osv(_('User Error'),
+                             _('Invalide file type %s. please use csv or xls') % (ftype))
         self.keys_to_validate = keys_to_validate
         self.convertion_dict = convertion_dict
         self.fieldnames = header
@@ -99,7 +101,8 @@ class FileParser(BankStatementImportParser):
             parsed_cols = self.result_row_list[0].keys()
             for col in self.keys_to_validate:
                 if col not in parsed_cols:
-                    raise Exception(_('Column %s not present in file') % (col))
+                    raise except_osv(_('Invalid data'),
+                                     _('Column %s not present in file') % (col))
         return True
 
     def _post(self, *args, **kwargs):
@@ -149,11 +152,27 @@ class FileParser(BankStatementImportParser):
         for line in result_set:
             for rule in conversion_rules:
                 if conversion_rules[rule] == datetime.datetime:
-                    date_string = line[rule].split(' ')[0]
-                    line[rule] = datetime.datetime.strptime(date_string,
-                                                            '%Y-%m-%d')
+                    try:
+                        date_string = line[rule].split(' ')[0]
+                        line[rule] = datetime.datetime.strptime(date_string,
+                                                                '%Y-%m-%d')
+                    except ValueError, err:
+                        raise except_osv(_('Invalid data'),
+                                         _("Date format is not valid."
+                                           " It should be YYYY-MM-DD for column: %s"
+                                           " value: %s"
+                                           " \n line: %s \n Detail: %s") % (rule, line[rule],
+                                                                            line, repr(err)))
                 else:
-                    line[rule] = conversion_rules[rule](line[rule])
+                    try:
+                        line[rule] = conversion_rules[rule](line[rule])
+                    except Exception, err:
+                        raise except_osv(_('Invalid data'),
+                                         _("Value %s of column % is not valid."
+                                           "\n line: %s "
+                                           "\n Detail: %s") % (line[rule], rule,
+                                                               line, repr(err)))
+
         return result_set
 
     def _from_xls(self, result_set, conversion_rules):
@@ -164,10 +183,26 @@ class FileParser(BankStatementImportParser):
         for line in result_set:
             for rule in conversion_rules:
                 if conversion_rules[rule] == datetime.datetime:
-                    t_tuple = xlrd.xldate_as_tuple(line[rule], self._datemode)
-                    line[rule] = datetime.datetime(*t_tuple)
+                    try:
+                        t_tuple = xlrd.xldate_as_tuple(line[rule], self._datemode)
+                        line[rule] = datetime.datetime(*t_tuple)
+                    except Exception, err:
+                        raise except_osv(_('Invalid data'),
+                                         _("Date format is not valid. You should modify the cell formatting"
+                                           " of your column to be of type date."
+                                           " For column: %s"
+                                           " value: %s"
+                                           " \n line: %s \n Detail: %s") % (rule, line[rule],
+                                                                            line, repr(err)))
                 else:
-                    line[rule] = conversion_rules[rule](line[rule])
+                    try:
+                        line[rule] = conversion_rules[rule](line[rule])
+                    except Exception, err:
+                        raise except_osv(_('Invalid data'),
+                                         _("Value %s of column % is not valid."
+                                           "\n line: %s "
+                                           "\n Detail: %s") % (line[rule], rule,
+                                                               line, repr(err)))
         return result_set
 
     def _cast_rows(self, *args, **kwargs):
diff --git a/account_statement_base_import/parser/generic_file_parser.py b/account_statement_base_import/parser/generic_file_parser.py
index 84ddc3c6..d2e04e7d 100644
--- a/account_statement_base_import/parser/generic_file_parser.py
+++ b/account_statement_base_import/parser/generic_file_parser.py
@@ -29,6 +29,11 @@ try:
 except:
     raise Exception(_('Please install python lib xlrd'))
 
+def float_or_zero(val):
+    """ Convertion function used to manage
+    empty string into float usecase"""
+    return val and float(val) or 0.0
+
 
 class GenericFileParser(FileParser):
     """
@@ -42,8 +47,8 @@ class GenericFileParser(FileParser):
                             'ref': unicode,
                             'label': unicode,
                             'date': datetime.datetime,
-                            'amount': float,
-                            'commission_amount': float
+                            'amount': float_or_zero,
+                            'commission_amount': float_or_zero
                           }
         # Order of cols does not matter but first row of the file has to be header
         keys_to_validate = ['ref', 'label', 'date', 'amount', 'commission_amount']