[FIX] create new convention from amendment

models/sale.py

@@ -170,7 +170,7 @@ class Sale(models.Model):
         comodel_name="sale.order",
         string="Convention initiale",
         ondelete="restrict",
-        copy=True,
+        copy=False,
     )
     amendment_ids = fields.One2many(
         comodel_name="sale.order",
@@ -652,8 +652,10 @@ class Sale(models.Model):
         # Convention initiale si avenant
         convention_id = self if not self.convention_id else self.convention_id
 
-        new_convention_id = convention_id.with_context(from_copy=True).copy({
-            "payment_mode_id": convention_id.payment_mode_id.id
+        new_convention_id = self.with_context(from_copy=True).copy({
+            "payment_mode_id": convention_id.payment_mode_id.id,
+            "convention_id": False,
+            "is_amendment": False,
         })
 
         # Copie des documents existants sur la convention précédente
@@ -670,7 +672,7 @@ class Sale(models.Model):
             <a href="/mail/view?model=sale.order&res_id=%s"
             class="o_document_link" data-oe-id="%s" data-oe-model="sale.order"
             >%s</a>
-        """ % (convention_id.id, convention_id.id, convention_id.name)
+        """ % (self.id, self.id, self.name)
         new_convention_id.message_post(
             body=body_msg,
         )