first commit

modules/sale_shipment_cost/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 InvoiceLine(metaclass=PoolMeta):
+    __name__ = 'account.invoice.line'
+
+    cost_sale_shipments = fields.One2Many(
+        'stock.shipment.out', 'cost_sale_invoice_line',
+        "Cost Sale of Shipments",
+        readonly=True)
+
+    @classmethod
+    def copy(cls, lines, default=None):
+        default = default.copy() if default is not None else {}
+        default.setdefault('cost_sale_shipments', None)
+        return super().copy(lines, default=default)