Urgent: Web Service from Function Module

Hi guys, I am new to this area so please help to achieve following:

I want to show a demo to load data from a web service to BI. I have performed the following steps and don’t know how to process further. Please help me in the sense where do I put the logic to show fields on the web service and ….

1. I have created a web service data source in BI with four fields (Cal dat, material, amount and currency)

2. This created a Web Service /RFC FM automatically.

3. From this FM I created a web service (Utilities – create web service – from function module)

4. I followed the web service creation wizard.

Thanks,

sam