=== modified file 'account/account_move_line.py'
--- account/account_move_line.py	2010-04-27 23:50:13 +0000
+++ account/account_move_line.py	2010-04-29 08:23:27 +0000
@@ -467,7 +467,7 @@
         'journal_id': fields.many2one('account.journal', 'Journal', required=True, select=1),
         'blocked': fields.boolean('Litigation', help="You can check this box to mark the entry line as a litigation with the associated partner"),
 
-        'partner_id': fields.many2one('res.partner', 'Partner Ref.'),
+        'partner_id': fields.many2one('res.partner', 'Partner Ref.', select=1),
         'date_maturity': fields.date('Maturity date', help="This field is used for payable and receivable entries. You can put the limit date for the payment of this entry line."),
         'date': fields.related('move_id','date', string='Effective date', type='date', required=True,
             store={