Soap call to FlowActionsService erroring out

Summary:

I am trying to call 'Load Data From File' service using SoapUI as part of automation of an integration, by attaching the transformation formula.

I am using FlowActionsService

However, it gives an error :

: JBO-PAY:::PAY_FLOW_MND_PARAMS_NOT_PASSED: <MESSAGE><NUMBER>PAY-1636093</NUMBER><TEXT>The Transformation Formula field is a required field. Provide a value for this parameter

Content (required):

Version (include the version you are using, if applicable):

21B

Code Snippet (add any code snippets that support your topic, if applicable):

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:typ="http://xmlns.oracle.com/apps/hcm/processFlows/core/flowActionsService/types/"