Allow import / creation of new periods in tree view

views/scop_period_views.xml

@@ -8,7 +8,7 @@
             <field name="name">scop.period.tree</field>
             <field name="model">scop.period</field>
             <field name="arch" type="xml">
-                <tree string="Périodes" editable="bottom" create="false">
+                <tree string="Périodes" editable="bottom">
                     <field name="partner_id" options="{'no_open': True, 'no_create': True}"/>
                     <field name="start"/>
                     <field name="end"/>