diff -Nru tryton-modules-purchase-5.0.0/CHANGELOG tryton-modules-purchase-5.0.2/CHANGELOG
--- tryton-modules-purchase-5.0.0/CHANGELOG	2018-10-01 11:23:53.000000000 +0000
+++ tryton-modules-purchase-5.0.2/CHANGELOG	2019-03-15 18:29:08.000000000 +0000
@@ -1,3 +1,9 @@
+Version 5.0.2 - 2019-03-15
+* Bug fixes (see mercurial logs for details)
+
+Version 5.0.1 - 2019-02-19
+* Bug fixes (see mercurial logs for details)
+
 Version 5.0.0 - 2018-10-01
 * Bug fixes (see mercurial logs for details)
 * Add configured delay for processing purchase
diff -Nru tryton-modules-purchase-5.0.0/COPYRIGHT tryton-modules-purchase-5.0.2/COPYRIGHT
--- tryton-modules-purchase-5.0.0/COPYRIGHT	2018-10-01 11:23:53.000000000 +0000
+++ tryton-modules-purchase-5.0.2/COPYRIGHT	2019-03-15 18:29:08.000000000 +0000
@@ -1,6 +1,6 @@
-Copyright (C) 2008-2018 Cédric Krier.
+Copyright (C) 2008-2019 Cédric Krier.
 Copyright (C) 2008-2013 Bertrand Chenal.
-Copyright (C) 2008-2018 B2CK SPRL.
+Copyright (C) 2008-2019 B2CK SPRL.
 Copyright (C) 2004-2008 Tiny SPRL.
 
 This program is free software: you can redistribute it and/or modify
diff -Nru tryton-modules-purchase-5.0.0/debian/changelog tryton-modules-purchase-5.0.2/debian/changelog
--- tryton-modules-purchase-5.0.0/debian/changelog	2019-01-01 19:35:24.000000000 +0000
+++ tryton-modules-purchase-5.0.2/debian/changelog	2019-07-22 10:17:17.000000000 +0000
@@ -1,3 +1,26 @@
+tryton-modules-purchase (5.0.2-2) unstable; urgency=medium
+
+  * Add the actual upstream maintainer key to signing-key.asc.
+  * Bump the Standards-Version to 4.4.0, no changes needed.
+  * Update year of debian copyright.
+  * Setting the branch in the watch file to the fixed version 5.0.
+
+ -- Mathias Behrle <mathiasb@m9s.biz>  Mon, 22 Jul 2019 12:17:17 +0200
+
+tryton-modules-purchase (5.0.2-1) unstable; urgency=medium
+
+  * Merging upstream version 5.0.2.
+
+ -- Mathias Behrle <mathiasb@m9s.biz>  Mon, 18 Mar 2019 12:00:31 +0100
+
+tryton-modules-purchase (5.0.1-1) unstable; urgency=medium
+
+  * Bump the Standards-Version to 4.3.0, no changes needed.
+  * Merging upstream version 5.0.1.
+  * Updating copyright file.
+
+ -- Mathias Behrle <mathiasb@m9s.biz>  Wed, 20 Feb 2019 11:06:11 +0100
+
 tryton-modules-purchase (5.0.0-2) unstable; urgency=medium
 
   * Cleanup white space.
diff -Nru tryton-modules-purchase-5.0.0/debian/control tryton-modules-purchase-5.0.2/debian/control
--- tryton-modules-purchase-5.0.0/debian/control	2019-01-01 16:25:37.000000000 +0000
+++ tryton-modules-purchase-5.0.2/debian/control	2019-07-20 11:47:07.000000000 +0000
@@ -7,7 +7,7 @@
                dh-python,
                python3,
                python3-setuptools
-Standards-Version: 4.2.1
+Standards-Version: 4.4.0
 Vcs-Browser: https://salsa.debian.org/tryton-team/tryton-modules-purchase
 Vcs-Git: https://salsa.debian.org/tryton-team/tryton-modules-purchase.git
 Homepage: http://www.tryton.org/
diff -Nru tryton-modules-purchase-5.0.0/debian/copyright tryton-modules-purchase-5.0.2/debian/copyright
--- tryton-modules-purchase-5.0.0/debian/copyright	2018-12-03 12:22:12.000000000 +0000
+++ tryton-modules-purchase-5.0.2/debian/copyright	2019-07-20 11:51:22.000000000 +0000
@@ -1,16 +1,16 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 
 Files: *
-Copyright: 2008-2018 Cédric Krier
+Copyright: 2008-2019 Cédric Krier
            2008-2013 Bertrand Chenal
-           2008-2018 B2CK SPRL
+           2008-2019 B2CK SPRL
            2004-2008 Tiny SPRL
 License: GPL-3+
 
 Files: debian/*
 Copyright:
            2009-2012 Daniel Baumann <daniel@debian.org>
-           2012-2018 Mathias Behrle <mathiasb@m9s.biz>
+           2012-2019 Mathias Behrle <mathiasb@m9s.biz>
 License: GPL-3+
 
 License: GPL-3+
diff -Nru tryton-modules-purchase-5.0.0/debian/upstream/signing-key.asc tryton-modules-purchase-5.0.2/debian/upstream/signing-key.asc
--- tryton-modules-purchase-5.0.0/debian/upstream/signing-key.asc	2019-01-01 16:25:37.000000000 +0000
+++ tryton-modules-purchase-5.0.2/debian/upstream/signing-key.asc	2019-07-20 11:47:07.000000000 +0000
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 -----END PGP PUBLIC KEY BLOCK-----
diff -Nru tryton-modules-purchase-5.0.0/debian/watch tryton-modules-purchase-5.0.2/debian/watch
--- tryton-modules-purchase-5.0.0/debian/watch	2019-01-01 16:25:37.000000000 +0000
+++ tryton-modules-purchase-5.0.2/debian/watch	2019-07-20 11:53:01.000000000 +0000
@@ -1,2 +1,2 @@
 version=3
-opts=pgpsigurlmangle=s/$/.asc/ https://downloads.tryton.org/current/ .*trytond_purchase-(\d.*)\.(?:tgz|tbz2|txz|tar\.(?:gz|bz2|xz))
+opts=pgpsigurlmangle=s/$/.asc/ https://downloads.tryton.org/5.0/ .*trytond_purchase-(\d.*)\.(?:tgz|tbz2|txz|tar\.(?:gz|bz2|xz))
diff -Nru tryton-modules-purchase-5.0.0/.hgtags tryton-modules-purchase-5.0.2/.hgtags
--- tryton-modules-purchase-5.0.0/.hgtags	2018-10-01 11:23:53.000000000 +0000
+++ tryton-modules-purchase-5.0.2/.hgtags	2019-03-15 18:29:08.000000000 +0000
@@ -19,3 +19,5 @@
 15a64f104f322d0827d44773911d4e0a9aebba5f 4.6.0
 4221e2277ff99417e520483bfd5dc2157882249a 4.8.0
 a19d4f68a99f24f220200eef7949504a3849bfbb 5.0.0
+f5ebf3ae588b8321f3cb5b88a93b49519e060701 5.0.1
+7617dfc0c2d4af432fb4771a23dd6b5108c90137 5.0.2
diff -Nru tryton-modules-purchase-5.0.0/PKG-INFO tryton-modules-purchase-5.0.2/PKG-INFO
--- tryton-modules-purchase-5.0.0/PKG-INFO	2018-10-01 11:23:54.000000000 +0000
+++ tryton-modules-purchase-5.0.2/PKG-INFO	2019-03-15 18:29:09.000000000 +0000
@@ -1,13 +1,12 @@
 Metadata-Version: 1.2
 Name: trytond_purchase
-Version: 5.0.0
+Version: 5.0.2
 Summary: Tryton module for purchase
 Home-page: http://www.tryton.org/
 Author: Tryton
 Author-email: issue_tracker@tryton.org
 License: GPL-3
 Download-URL: http://downloads.tryton.org/5.0/
-Description-Content-Type: UNKNOWN
 Description: trytond_purchase
         ================
         
diff -Nru tryton-modules-purchase-5.0.0/purchase.py tryton-modules-purchase-5.0.2/purchase.py
--- tryton-modules-purchase-5.0.0/purchase.py	2018-08-31 23:02:13.000000000 +0000
+++ tryton-modules-purchase-5.0.2/purchase.py	2019-02-28 21:43:56.000000000 +0000
@@ -846,6 +846,7 @@
     @ModelView.button
     def process(cls, purchases):
         process, done = [], []
+        cls.__lock(purchases)
         for purchase in purchases:
             purchase.create_invoice()
             purchase.set_invoice_state()
@@ -867,6 +868,25 @@
             cls.do(done)
 
     @classmethod
+    def __lock(cls, records):
+        from trytond.tools import grouped_slice, reduce_ids
+        from sql import Literal, For
+        transaction = Transaction()
+        database = transaction.database
+        connection = transaction.connection
+        table = cls.__table__()
+
+        if database.has_select_for():
+            for sub_records in grouped_slice(records):
+                where = reduce_ids(table.id, sub_records)
+                query = table.select(
+                    Literal(1), where=where, for_=For('UPDATE', nowait=True))
+                with connection.cursor() as cursor:
+                    cursor.execute(*query)
+        else:
+            database.lock(connection, cls._table)
+
+    @classmethod
     @ModelView.button_action('purchase.wizard_modify_header')
     def modify_header(cls, purchases):
         pass
@@ -1283,8 +1303,8 @@
         else:
             return self.purchase.party.supplier_location.id
 
-    @fields.depends('product', 'quantity', 'moves', 'purchase',
-        '_parent_purchase.purchase_date', '_parent_purchase.party',
+    @fields.depends('product_supplier', 'quantity', 'moves', 'purchase',
+        '_parent_purchase.purchase_date',
         'delivery_date_edit', 'delivery_date_store',
         '_parent_purchase.delivery_date')
     def on_change_with_delivery_date(self, name=None):
@@ -1300,19 +1320,15 @@
             delivery_date = self.delivery_date_store
         elif self.purchase and self.purchase.delivery_date:
             delivery_date = self.purchase.delivery_date
-        elif (self.product
+        elif (self.product_supplier
                 and self.quantity is not None
                 and self.quantity > 0
-                and self.purchase and self.purchase.party
-                and self.product.product_suppliers):
+                and self.purchase):
             date = self.purchase.purchase_date if self.purchase else None
-            for product_supplier in self.product.product_suppliers:
-                if product_supplier.party == self.purchase.party:
-                    delivery_date = product_supplier.compute_supply_date(
-                        date=date)
-                    if delivery_date == datetime.date.max:
-                        delivery_date = None
-                    break
+            delivery_date = self.product_supplier.compute_supply_date(
+                date=date)
+            if delivery_date == datetime.date.max:
+                delivery_date = None
         if delivery_date and delivery_date < Date.today():
             delivery_date = None
         return delivery_date
diff -Nru tryton-modules-purchase-5.0.0/tox.ini tryton-modules-purchase-5.0.2/tox.ini
--- tryton-modules-purchase-5.0.0/tox.ini	2018-08-18 09:54:56.000000000 +0000
+++ tryton-modules-purchase-5.0.2/tox.ini	2019-02-28 21:43:56.000000000 +0000
@@ -12,4 +12,4 @@
     postgresql: TRYTOND_DATABASE_URI={env:POSTGRESQL_URI:postgresql://}
     sqlite: DB_NAME={env:SQLITE_NAME::memory:}
     postgresql: DB_NAME={env:POSTGRESQL_NAME:test}
-install_command = pip install --pre --process-dependency-links {opts} {packages}
+install_command = pip install --pre --find-links https://trydevpi.tryton.org/ {opts} {packages}
diff -Nru tryton-modules-purchase-5.0.0/tryton.cfg tryton-modules-purchase-5.0.2/tryton.cfg
--- tryton-modules-purchase-5.0.0/tryton.cfg	2018-10-01 11:23:52.000000000 +0000
+++ tryton-modules-purchase-5.0.2/tryton.cfg	2019-02-28 21:43:56.000000000 +0000
@@ -1,5 +1,5 @@
 [tryton]
-version=5.0.0
+version=5.0.2
 depends:
     account
     account_invoice
diff -Nru tryton-modules-purchase-5.0.0/trytond_purchase.egg-info/PKG-INFO tryton-modules-purchase-5.0.2/trytond_purchase.egg-info/PKG-INFO
--- tryton-modules-purchase-5.0.0/trytond_purchase.egg-info/PKG-INFO	2018-10-01 11:23:54.000000000 +0000
+++ tryton-modules-purchase-5.0.2/trytond_purchase.egg-info/PKG-INFO	2019-03-15 18:29:09.000000000 +0000
@@ -1,13 +1,12 @@
 Metadata-Version: 1.2
 Name: trytond-purchase
-Version: 5.0.0
+Version: 5.0.2
 Summary: Tryton module for purchase
 Home-page: http://www.tryton.org/
 Author: Tryton
 Author-email: issue_tracker@tryton.org
 License: GPL-3
 Download-URL: http://downloads.tryton.org/5.0/
-Description-Content-Type: UNKNOWN
 Description: trytond_purchase
         ================