I have two data files. One contains orders (day and article identifier) and the other one contains the returns (day and article identifier). I want to calculate the inventory level (inventory level of day before - orders + returns). Furthermore, not every day there is an order and/or a return.
I think it is very simple but I tried many things (Java Snippet, Python, "normal nodes") and didn`t get it. Can give me someone an advice how I could do this?
Thanks a lot