Remove required period fields since failing import

models/scop_period.py

@@ -31,13 +31,13 @@ class ScopPeriod(models.Model):
     cooperative_form_id = fields.Many2one(
         'res.partner.cooperative.form',
         string="Cooperative form",
-        on_delete='restrict', required=True)
+        on_delete='restrict')
     partner_company_type_id = fields.Many2one(
         comodel_name='res.partner.company.type',
         string='Legal Form',
         track_visibility='onchange',
-        on_delete='restrict', required=True)
-    siret = fields.Char(string='SIRET', size=14, required=True)
+        on_delete='restrict')
+    siret = fields.Char(string='SIRET', size=14)
     street = fields.Char()
     street2 = fields.Char()
     street3 = fields.Char()