help="It indicates that an invoice has been validated"),
'invoiced_rate': fields.function(_invoiced_rate, string='Invoiced', type='float'),
'invoice_method': fields.selection([('manual','Based on Purchase Order lines'),('order','Based on generated draft invoice'),('picking','Based on incoming shipments')], 'Invoicing Control', required=True,
- readonly=True, states={'draft':[('readonly',False)], 'sent':[('readonly',False)]},
+ readonly=True, states={'draft':[('readonly',False)], 'sent':[('readonly',False)],'bid':[('readonly',False)]},
help="Based on Purchase Order lines: place individual lines in 'Invoice Control / On Purchase Order lines' from where you can selectively create an invoice.\n" \
"Based on generated invoice: create a draft invoice you can validate later.\n" \
"Based on incoming shipments: let you create an invoice when receipts are validated."