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modules/account_tax_cash/party.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
+from trytond.transaction import Transaction
+
+
+class Party(metaclass=PoolMeta):
+    __name__ = 'party.party'
+
+    supplier_tax_group_on_cash_basis = fields.Many2Many(
+        'account.tax.group.cash', 'party', 'tax_group',
+        "Supplier Tax Group On Cash Basis",
+        help="The tax group reported on cash basis for this supplier.")
+
+    @classmethod
+    def copy(cls, parties, default=None):
+        default = default.copy() if default else {}
+        if Transaction().check_access:
+            default.setdefault(
+                'supplier_tax_group_on_cash_basis',
+                cls.default_get(
+                    ['supplier_tax_group_on_cash_basis'],
+                    with_rec_name=False).get(
+                    'supplier_tax_group_on_cash_basis'))
+        return super().copy(parties, default=default)