_lastHttpResponseBody in BPM Flowhart

[Ceonello]

I have a simple flowchart attached to Case creation that send an http request to an external service and then retrieve the result to update the target record.
I used the formula json\retrieve($_lastHttpResponseBody, 'generated') to retrieve an attribute from the body, but it returns the error:
function: json\retrieve, index: 1, should be: string [] []
I also tried to log the _lastHttpResponseBody content with a custom formula and it looks like the _lastHttpResponseBody variable is always empty.
I also tried with a sample rest service (https://reqres.in) to be sure that it was not my APi fault, and the _lastHttpResponseBody is always empty.
My advanced pack version is 2.8.4
any help?
thank you

[dimyy]

Show full process config.

This example (attached) working fine

[Ceonello]

Ok, thank you for the support, now it's working.
The problem was that I was retrieving the $_lastHttpResponseBody on a subsequent step of the flowchart and not in the same step as your example shown, so i changed my flowchart from this:



to this




Thank you