diff --git a/trytond/osv/fields.py b/trytond/osv/fields.py
index 65f1af8578..92bbe76a16 100644
--- a/trytond/osv/fields.py
+++ b/trytond/osv/fields.py
@@ -563,6 +563,7 @@ class Function(Column):
         self._fnct = fnct
         self._fnct_inv = fnct_inv
         self._arg = arg
+        self._field = ''
         self._obj = ''
         if 'relation' in args:
             self._obj = args['relation']
diff --git a/trytond/osv/orm.py b/trytond/osv/orm.py
index f288cdeff5..987b28d893 100644
--- a/trytond/osv/orm.py
+++ b/trytond/osv/orm.py
@@ -7,6 +7,7 @@ import fields
 from trytond.tools import Cache
 import md5
 import time
+import traceback
 
 ID_MAX = 1000
 
@@ -75,10 +76,11 @@ class BrowseRecord(object):
                 return getattr(self._table, name)
             else:
                 logger = Logger()
+                stack = ''.join(traceback.format_stack())
                 logger.notify_channel('orm', LOG_ERROR,
                         "Programming error: field '%s' " \
-                                "does not exist in object '%s'!" % \
-                                (name, self._table._name))
+                                "does not exist in object '%s'!\n%s" % \
+                                (name, self._table._name, stack))
                 return False
 
             # if the field is a classic one or a many2one,
diff --git a/trytond/osv/osv.py b/trytond/osv/osv.py
index 9cdb54795e..04f6fb0d49 100644
--- a/trytond/osv/osv.py
+++ b/trytond/osv/osv.py
@@ -7,6 +7,7 @@ import copy
 import sys
 from psycopg2 import IntegrityError
 from trytond.tools import UpdateableDict
+import traceback
 
 MODULE_LIST = []
 MODULE_CLASS_LIST = {}
@@ -61,7 +62,6 @@ class OSVService(Service):
                             self._sql_error[key])
             self.abort_response('Integrity Error', 'warning', inst[0])
         except:
-            import traceback
             tb_s = reduce(lambda x, y: x+y, traceback.format_exception(
                 sys.exc_type, sys.exc_value, sys.exc_traceback))
             logger = Logger()
@@ -87,7 +87,26 @@ class OSVService(Service):
 
     def exec_workflow_cr(self, cursor, user, object_name, method, *args):
         wf_service = LocalService("workflow")
-        wf_service.trg_validate(user, object_name, args[0], method, cursor)
+        try:
+            wf_service.trg_validate(user, object_name, args[0], method, cursor)
+        except ExceptORM, inst:
+            self.abort_response(inst.name, 'warning', inst.value)
+        except ExceptOSV, inst:
+            self.abort_response(inst.name, inst.exc_type, inst.value)
+        except IntegrityError, inst:
+            for key in self._sql_error.keys():
+                if key in inst[0]:
+                    self.abort_response('Constraint Error', 'warning',
+                            self._sql_error[key])
+            self.abort_response('Integrity Error', 'warning', inst[0])
+
+        except:
+            tb_s = reduce(lambda x, y: x+y, traceback.format_exception(
+                sys.exc_type, sys.exc_value, sys.exc_traceback))
+            logger = Logger()
+            logger.notify_channel("web-services", LOG_ERROR,
+                    'Exception in call: \n' + tb_s)
+            raise
         return True
 
     def exec_workflow(self, dbname, user, object_name, method, *args):
diff --git a/trytond/report/report.py b/trytond/report/report.py
index b509f077c3..c5bd7ee415 100644
--- a/trytond/report/report.py
+++ b/trytond/report/report.py
@@ -287,7 +287,7 @@ class Report(object):
             if hasattr(res, '__str__'):
                 res = res.__str__()
             if isinstance(res, basestring):
-                node.nodeValue = res
+                node.nodeValue = res.decode('utf-8')
                 node.parentNode.parentNode.replaceChild(node, node.parentNode)
             return res
         if 'language' in localcontext: