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modules/sale_promotion_coupon_payment/sale.py

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+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+
+from trytond.model import fields
+from trytond.pool import PoolMeta
+
+
+class Sale(metaclass=PoolMeta):
+    __name__ = 'sale.sale'
+
+    @fields.depends('party')
+    def _coupon_parties(self):
+        parties = super()._coupon_parties()
+        if self.party:
+            parties.update(self.party.payment_identical_parties)
+        return parties