Cannot access to a function in a webService

Hi all,

i am trying to consume a function in a web service published in BC. In postman, I get this error:

In the WSDL, I can see tthat the function is published:

This is how the function looks like:

Must add that in this codeunit, I already have fucntions that are consumed without any problem. I’m afraid that the problem might be the comples type sent by parameter…