How to develop an Remote Enabled Function Module

Hi All,

I'm totally new to ABAP. I have a requirement to create a Remote Enabled Function Module, which I can use to call from an external program like Java using JCo.

The functionality of the Remote Function is to write some data into certain fields of the tables AFPO and JEST.

Can someone please guide me, how to do the above described task. Is there any code snippets available, that would be really gr8.

Thanks & Best Regards,

Chandrasekhar.