A first module collects a quantity per month, client, and product. For each month/client/product, a warehouse (list element) is defined. Based on the warehouse, the start month is calculated (Time Period Format). My goal is to be able, in another module, to sum the quantities by products/warehouses/start month. When I try to create a formula like Quantity[Sum: Warehouse of departure, Sum: Product, Sum: Start Month of Departure], it does not apply.
Do you have any idea to help me achieve the expected result?