diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index 13803d3ff79..ca66c7e1b4d 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -481,8 +481,8 @@ class account_move_line(osv.osv):
         'quantity': fields.float('Quantity', digits=(16,2), help="The optional quantity expressed by this line, eg: number of product sold. The quantity is not a legal requirement but is very useful for some reports."),
         'product_uom_id': fields.many2one('product.uom', 'UoM'),
         'product_id': fields.many2one('product.product', 'Product'),
-        'debit': fields.float('Debit', digits_compute=dp.get_precision('Account')),
-        'credit': fields.float('Credit', digits_compute=dp.get_precision('Account')),
+        'debit': fields.float('Debit', digits_compute=dp.get_precision('Account'), required=True),
+        'credit': fields.float('Credit', digits_compute=dp.get_precision('Account'), required=True),
         'account_id': fields.many2one('account.account', 'Account', required=True, ondelete="cascade", domain=[('type','<>','view'), ('type', '<>', 'closed')], select=2),
         'move_id': fields.many2one('account.move', 'Move', ondelete="cascade", help="The move of this entry line.", select=2, required=True),
         'narration': fields.related('move_id','narration', type='text', relation='account.move', string='Internal Note'),
@@ -559,6 +559,8 @@ class account_move_line(osv.osv):
         'state': 'draft',
         'currency_id': _get_currency,
         'journal_id': lambda self, cr, uid, c: c.get('journal_id', False),
+        'credit': 0.0,
+        'debit': 0.0,
         'account_id': lambda self, cr, uid, c: c.get('account_id', False),
         'period_id': lambda self, cr, uid, c: c.get('period_id', False),
         'company_id': lambda self, cr, uid, c: self.pool.get('res.company')._company_default_get(cr, uid, 'account.move.line', context=c)