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modules/sale_advance_payment/stock.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.i18n import gettext
+from trytond.model import ModelView, Workflow
+from trytond.pool import Pool, PoolMeta
+
+from .exceptions import ShippingBlocked
+
+
+class ShipmentOut(metaclass=PoolMeta):
+    __name__ = 'stock.shipment.out'
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('packed')
+    def pack(cls, shipments):
+        pool = Pool()
+        Sale = pool.get('sale.sale')
+        SaleLine = pool.get('sale.line')
+
+        sales = {move.origin.sale
+            for shipment in shipments for move in shipment.moves
+            if isinstance(move.origin, SaleLine)}
+        for sale in Sale.browse([s.id for s in sales]):
+            if sale.shipping_blocked:
+                raise ShippingBlocked(
+                    gettext('sale_advance_payment.msg_shipping_blocked',
+                        sale=sale.rec_name))
+        super().pack(shipments)