Solution : https://service.sap.com/sap/support/notes/1593467 (SAP Service marketplace login required)
Key words :
sap web service abap consumer, web servcie provider expects, send soap request, terms inputaction reason, empty soapaction, default action, solution apply, installing note 1587826, note 1587826, prerequisites
Related Notes :
| 1587826 | wsa:Action header is missing in request if WSA is enabled |
| 1575707 | ABAP Web Service Connectivity - New Features in Release 7.02 |