Initial import from Docker volume

modules/account_dunning_letter/__init__.py

@@ -0,0 +1,18 @@
+# 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 dunning
+
+
+def register():
+    Pool.register(
+        dunning.Level,
+        module='account_dunning_letter', type_='model')
+    Pool.register(
+        dunning.ProcessDunning,
+        module='account_dunning_letter', type_='wizard')
+    Pool.register(
+        dunning.Letter,
+        module='account_dunning_letter', type_='report')