From 3f0d75766d86c8a984f9dbc9c42f18fd3e0b219b Mon Sep 17 00:00:00 2001
From: Ralf Peschke <rpit58@gmail.com>
Date: Thu, 24 Sep 2015 10:34:12 +0200
Subject: [PATCH] Prevalidate invoice date on 'in invoice' and 'in credit note'

issue4865
review18401002
---
 invoice.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/invoice.py b/invoice.py
index 5ba7a4aca6..811bb8845b 100644
--- a/invoice.py
+++ b/invoice.py
@@ -250,9 +250,21 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
                         'tryton-go-previous'),
                     },
                 'validate_invoice': {
+                    'pre_validate':
+                        ['OR',
+                            ('invoice_date', '!=', None),
+                            ('type', 'not in',
+                                ['in_invoice', 'in_credit_note']),
+                        ],
                     'invisible': Eval('state') != 'draft',
                     },
                 'post': {
+                    'pre_validate':
+                        ['OR',
+                            ('invoice_date', '!=', None),
+                            ('type', 'not in',
+                                ['in_invoice', 'in_credit_note']),
+                        ],
                     'invisible': ~Eval('state').in_(['draft', 'validated']),
                     },
                 'pay': {