400 Response error in CPI to be sent to source ECC - Sync interface

Hi Experts,

Target system API is throwing 400 response.I am able to capture the response body through groovy script and send it via email.

But the message is failing in ECC with HTTP 400 error. ECC wants the response to be sent for both success and failed status.

Is it possible to send the 400 response back to ECC?

Regards,

Karthiga