Use the appropriate patch for issue8413.

issue8413.diff

@@ -1,12 +1,22 @@
-diff -r 254e4bb38458 carrier.py
+Index: carrier.py
---- a/trytond/trytond/modules/carrier/carrier.py	Mon May 06 15:01:12 2019 +0200
+===================================================================
-+++ b/trytond/trytond/modules/carrier/carrier.py	Mon Jun 10 10:00:08 2019 +0200
+--- a/trytond/trytond/modules/carrier/carrier.py
-@@ -13,6 +13,8 @@
++++ b/trytond/trytond/modules/carrier/carrier.py
- class Carrier(ModelSQL, ModelView):
+@@ -32,6 +32,17 @@
-     'Carrier'
+     def get_rec_name(self, name):
-     __name__ = 'carrier'
+         return '%s - %s' % (self.party.rec_name, self.carrier_product.rec_name)
-+    _rec_name = 'party'
+ 
++    @classmethod
++    def search_rec_name(cls, name, clause):
++        if clause[1].startswith('!') or clause[1].startswith('not '):
++            bool_op = 'AND'
++        else:
++            bool_op = 'OR'
++        return [bool_op,
++            ('party.rec_name',) + tuple(clause[1:]),
++            ('carrier_product.rec_name',) + tuple(clause[1:]),
++            ]
 +
-     party = fields.Many2One('party.party', 'Party', required=True,
+     def get_sale_price(self):
-             ondelete='CASCADE', help="The party which represents the carrier.")
+         'Compute carrier sale price with currency'
-     carrier_product = fields.Many2One('product.product', 'Carrier Product',
+         User = Pool().get('res.user')