@Scott and @Gassim we deal with things like this in event reports all the time. Basically once an event report is saved, if you reload the report, it will lose the details of the DEs that are selected in the pillbox “Selected data items” Both the names and the filters (if any existed) will not exist. The data itself, upon load, will still function alright. Once you do any update at all, however, the DEs and their filters go away.
https://play.dhis2.org/2.35.8/dhis-web-event-reports/index.html?id=TIuOzZ0ID0V Is an event report in Play
Here’s a GIF of what happens when you load it, toggle on/off a period, and press update (DE columns get removed, filter stops filtering):
This is happening in both 2.35.8 and 2.36.4, and I haven’t tested but assuming also in 2.37.0