Could you share your filter settings?
Have you investigated the filtered result in the debug mode or do you get a error in the modeller (if yes, which one)?
Thats right, you’re filter option says that you will only the first day of your month will be filtered. I assume your data is persistent data, isn’t it? Have you tried to use and filter by a xpath call? So that means you retrieve from the database a list based on your filter criterias by xpath and then you can use the aggregeation onthe result list.