Initial import from Docker volume

modules/sale_invoice_grouping/__init__.py

@@ -0,0 +1,16 @@
+# 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.pool import Pool
+
+from . import configuration, party, sale
+
+
+def register():
+    Pool.register(
+        sale.Sale,
+        party.Party,
+        party.PartySaleInvoiceGroupingMethod,
+        configuration.Configuration,
+        configuration.ConfigurationSaleMethod,
+        module='sale_invoice_grouping', type_='model')