Dear Jaroslaw,
Please confirm with basis team is the production client open?? If the client is open we can do any changes in without request.
I would like to tell you one more thing is that SWFDVEVTY1 this is the maintenance view for T-code swetypv.
SWFDVEVTY1 uses two table SWFDEVTYP SWFDEVENA.
If you can check the both table technical setting log data changes is checked mark. So I it would help you for finding the things.
Thanks
Nishant