Hi Thomas,
Only successfully booked requests - Always works But you need to set older than days are 1 to N. not zero. If you set as zero and if you load daily once then there won't be a request to delete and even its depend one process where you added. if you added this before dso dtp, it won't works.
if you add before dso dtp and older than as 1 day, then it will works.
At which step you added this process After the dso activation or before dso load.
as my guess better to delete change log deletion older than 2 to no days. because its delta data, give some time to do report on connected targets. once there is no issue then you can delete them.
Add change log deletion step after the dso activation or before loading to dso. but keep older than as 2 to N days. regarding days you can check with your TL or users.
Thanks