diff --git a/bin/addons/base/ir/ir_model.py b/bin/addons/base/ir/ir_model.py
index de1b2f0c53f..7fc27f6cc78 100644
--- a/bin/addons/base/ir/ir_model.py
+++ b/bin/addons/base/ir/ir_model.py
@@ -229,6 +229,9 @@ class ir_model_fields(osv.osv):
         'field_description': lambda *a: '',
     }
     _order = "id"
+    _sql_constraints = [
+        ('size_gt_zero', 'CHECK (size>0)', 'Size of the field can never be less than 1 !'),
+    ]
     def unlink(self, cr, user, ids, context=None):
         for field in self.browse(cr, user, ids, context):
             if field.state <> 'manual':
@@ -244,17 +247,18 @@ class ir_model_fields(osv.osv):
             vals['model'] = model_data.model
         if context and context.get('manual',False):
             vals['state'] = 'manual'
-        res = super(ir_model_fields,self).create(cr, user, vals, context)
+        res = super(ir_model_fields,self).create(cr, user, vals, context)    
         if vals.get('state','base') == 'manual':
             if not vals['name'].startswith('x_'):
                 raise except_orm(_('Error'), _("Custom fields must have a name that starts with 'x_' !"))
             
             if 'relation' in vals and not self.pool.get('ir.model').search(cr, user, [('model','=',vals['relation'])]):
                  raise except_orm(_('Error'), _("Model %s Does not Exist !" % vals['relation']))
-
+                 
             if self.pool.get(vals['model']):
                 self.pool.get(vals['model']).__init__(self.pool, cr)
                 self.pool.get(vals['model'])._auto_init(cr, {})
+                
         return res
 ir_model_fields()