Web service method not found

Hi, have to do a webservice soap request in which i must pass a obj file. In order to pass this file i created a custom library.

It’s impossible that this method is not found because i tested it outside uipath and it works properly. uipath studio 2021.4.4

SOAP Request: Method ‘InvoiceChannelWebServiceClient.pushSynchronousRemoteItem’ not found.