Para fecha promesa de pago agregar.

__init__.py

@@ -1,2 +1,2 @@
 # -*- coding: utf-8 -*-
-import models
+from models import account_invoice_date

models/__init__.py

@@ -1,2 +1 @@
-# -*- coding: utf-8 -*-
-import account_invoice_date
+

models/account_invoice_date.py

@@ -9,4 +9,4 @@ from dateutil.relativedelta import relativedelta
 class AccountInvoice(models.Model):
     _inherit = 'account.invoice'
 
-    date_pay = fields.Date("Fecha de Posible Pago")
+    date_pay = fields.Date("Fecha Promesa Pago")