webservice SAP

I'm having trouble executing my webservice on a SAP backend. Running a microflow that calls the webservice returns: lh: A valid SOAPAction should be set in the RequestContext when Addressing is enabled, Use BindingProvider.SOAPACTION_URI_PROPERTY to set it. at UWL.Import_UWL (CallWebservice : 'Call web service 'SwiQueryWorkitems'') While the exact same request i use in soapUI returns no errors... Can anyone help me out?
1 answers

Maybe there is some difference between the soap headers from mendix and soapui. Maybe you could try to set up a http tunnel in soapui and redirect the call from mendix to soapui and then to your sap backend.