first commit

modules/project/party.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.modules.party.exceptions import EraseError
+from trytond.pool import Pool, PoolMeta
+
+
+class Replace(metaclass=PoolMeta):
+    __name__ = 'party.replace'
+
+    @classmethod
+    def fields_to_replace(cls):
+        return super().fields_to_replace() + [
+            ('project.work', 'party'),
+            ]
+
+
+class Erase(metaclass=PoolMeta):
+    __name__ = 'party.erase'
+
+    def check_erase_company(self, party, company):
+        pool = Pool()
+        Work = pool.get('project.work')
+        super().check_erase_company(party, company)
+
+        works = Work.search([
+                ('party', '=', party.id),
+                ('company', '=', company.id),
+                ('progress', '!=', 1),
+                ])
+        if works:
+            raise EraseError(
+                gettext('project.msg_erase_party_opened_project',
+                    party=party.rec_name,
+                    company=company.rec_name))