Leave request workflow

Hi Experts,

I am creating leave request in portal. Approval process and everything is working fine(the workflow may be WS12300111). But when I checked in log I couldn't find a log for the same. When I created travel request it is coming in log.

I used SWI2_FREQ, SWEL, SWI1,SWIA tcodes for checking log but except leave request all the triggered workflow logs are coming.Leave request process is working fine.

Suggest me a solution how to get the log. Because I need to customize the workflow.

Thanks in advance.

Jeena George