How to see the log of incoming data as part of webservice

Hi Experts

We have a webservice based interface to get the sales orders data, this was created by exposing a RFC as a webservice.

For error analysis, is the way to store the incoming data for some days?

explored the options of Logs Configuration little bit but could not able to achieve yet.

Is there any steps to follow? Is there any settings needed? Please help.

Thanks

Madhu