Use tryton.cfg to register in the Pool

modules/document_incoming_invoice/__init__.py

@@ -1,16 +1,2 @@
 # 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 account, document
-
-__all__ = ['register']
-
-
-def register():
-    Pool.register(
-        account.Invoice,
-        document.IncomingConfiguration,
-        document.Incoming,
-        module='document_incoming_invoice', type_='model')

modules/document_incoming_invoice/tryton.cfg

@@ -8,3 +8,9 @@ depends:
 xml:
     document.xml
     message.xml
+
+[register]
+model:
+    account.Invoice
+    document.IncomingConfiguration
+    document.Incoming