[FIX]Bug on save several contract on operation

models/acc_contract.py

@@ -49,8 +49,9 @@ class AccContract(models.Model):
     # ------------------------------------------------------
     @api.model_create_multi
     def create(self, vals_list):
-        doc = super(AccContract, self).create(vals_list)
+        docs = super(AccContract, self).create(vals_list)
 
+        for doc in docs:
             if doc.seller_id:
                 template = self.env.ref(
                     "acc_operation.email_template_document", raise_if_not_found=False
@@ -61,7 +62,7 @@ class AccContract(models.Model):
                     "acc_operation.email_template_document", raise_if_not_found=False
                 )
                 template.with_context().send_mail(doc.buyer_id.id, force_send=True)
-        return doc
+        return docs
 
     # ------------------------------------------------------
     # Actions