For some reason this this formula sums everything twice and I can't see what is the problem. Would you have any ideas. The formula calculates properly without if(alt statement, but with that all results are multiplied with 2. There shouldn't be any duplicate rows in my data model; all these needed values are only once in my data model.
That wouldn't work. The reason why I need to use "alt"-statement here is that I want to include onlu those rows into calculation where Billing day doesn't exist, so with the normal if formula I get nothing.