How to handle input parameters in SOAP WebService Library

Hi together,
I am trying to set a SOAP Request by using the WSDL File. The service should generate the request out of the WSDL-File and not as a static xml string.

So what I have done:
As the SOAP activity does not give me the possibility to insert additional authentication parameter beside of password and username. I have used the HTTP-Request, with a custom request xml string. However we want to ensure consistency with the updates in WSDL.

As Referred in: Loading Web Services in Libraries
I have imported the web-service in my library.
While Importing, the preview is as follows:
WSDL Editor

However, I do not get the Input parameters, the activity needs.
Activities Panel

Below some screenshots of the WSDL-File, I refer to:

How can I set the value of certain properties with the imported namespace ?
I would have to set the values for multiple properties. I already was able to access them via calls like: input = input.executerequest.kontext.insert… as displayed in the following screenshot:

However, this results in an error stating object reference not set to an instance of an object, since the variable input is null. How can I initialize it properly?

Thanks for your support!

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