---
title: "Forcing the version of the response curves to use"
url: "https://apdupius.productfruits.help/en/article/forcing-the-version-of-the-response-curves-to-use"
language: "en"
last_updated: "2023-05-15T08:20:10.668Z"
---

# Forcing the version of the response curves to use

Here is how to point to specific response curves when running a scenario, via the JSON editor.

The principle is that the Optimizer uses the "latest" response curves when running a scenario - but there is a way to explicitly tell the Optimizer what Response Curves to use: it's with the field RESPONSE\_MODEL, which should be put at the same level as "USER\_SETTINGS" in the payload:

![](https://cdn-assets.productfruits.com/29955874-96e1-4bff-bd8a-e231ff3e44d0)

The value of the timestamp should be passed in this field to point to the appropriate response curves.

In addition, for now there is a legacy field that should also be passed and coherent with the "response\_model" version: the field "YEAR\_OPTIMIZER", which as a value should have the value of the year of the starting period of the response curves: so:

-   for the latest H2'22 refresh it should be "2022"
-   for the fiscal year (previous refresh), it should be "2021"

So here in our example as we were using the latest response curves, we set it to 2022:

![](https://cdn-assets.productfruits.com/c5687843-66f0-4924-b49b-ed04fea11c17)

The values that should be used are the following:

-   Latest Refresh H2'22, official version:
    -   "response\_model":"20230515\_074830"
    -   "YEAR\_OPTIMIZER":"2022"
-   Previous refresh (fiscal year):
    -   "response\_model":"20230324\_124217"
    -   "YEAR\_OPTIMIZER":"2021"