Responsys Program blocked at invoke stage

Hi,

we're developing an app that connects Responsys with a third party application.  We built the following program by inserting our custom application:

When we run the program, we notice that the record blocked at custom app stage:

In particular, seeing the application log (attached file), we noticed that the error seems related to the invoke response (Unrecognized field "istance_id") .

We send it when OMS call invoke URL. We send this response body message (as described in documentation: https://docs.oracle.com/en/cloud/saas/marketing/ams-develop/Developers/ams/develop/service-invoke.htm) :

{
"invocationId": "9343c7c2-925f-4360-bd69-54dd1864d630-1",