can you please tell more details for points "create Service zva03 in sicf" and "assing gui Parameters ~Transaction VA03 and ~webgui 1" ?
Create an ICF path
Go to SICF transaction; execute the report to get into the second screen.
Navigate to the path default_host/sap/bc/gui/sap/its and right click and select
Provide the description 1.
Change the GUI Link status to YES and click the GUI configurations
In the GUI configuration tab give the following parameters: