How to persist data within a workitem exit

Hi

I implemented a log observer which is called within a workitem exit (implements interface IF_SWF_IFS_WORKITEM_EXIT). Each workitem of my workflow has this workitem exit implemented. So in general this enables me to log further details in addition to the workflow log itself. Unfortunately my created log entries are not persisted by a COMMIT in spite of calling the workitem context method DO_COMMIT_WORK.

Does anybody has experience with that?

Thanks