Automating Workfront Request Approval Workflows error 422
I've been trying to build an automated approval workflow in Fusion by following the "Automating Workfront Request Approval Workflows" chapter within the Adobe Workfront Fusion Cookbook but have stumbled upon an error which I can't get beyond. I'm pretty new to Fusion so I may be making a rookie error.
I've followed the instructions as best as I can and have build the workflow as closely to the example as possible.

When I get to the Custom API Call (POST: Create Approval Process), I'm getting the following error: The operation failed with an error. [422] APIModel V16_0 does not support field shouldCreate (ApprovalPath)
This is the overall output:

This is the body:
- {"name":"Fusion Test_64df7da80032fe753f9eb4a3bcacbc7c","objCode":"ARVPRC","approvalPaths":[{"name":"ApprovalPath","objCode":"ARVPTH","shouldCreate":false,"targetStatus":"INP","approvalSteps":[{"name":"Head of Tech","objCode":"ARVSTP","approvalType":null,"stepApprovers":[{"userID":"605a06fe007acd798aaebadef50895a0"},{"userID":"633d90620004540cf20c730878d45f1c"},{"userID":"633d8e1e004eb0e3e993d22fa15497e3"}],"sequenceNumber":null}],"rejectedStatus":"REJ"}],"approvalObjCode":"OPTASK"}
What am I getting wrong here?
