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modules/document_incoming_invoice/account.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 Invoice(metaclass=PoolMeta):
+    __name__ = 'account.invoice'
+
+    documents_incoming = fields.One2Many(
+        'document.incoming', 'result', "Incoming Documents", readonly=True)
+
+    @classmethod
+    def copy(cls, invoices, default=None):
+        default = default.copy() if default is not None else {}
+        default.setdefault('documents_incoming')
+        return super().copy(invoices, default=default)