I would like to show you how to work with lookup columns between lists when you i.eg. would like to summarize the amount of orders that a sales person have made.
So we have a list called “Sales persons” with five columns, “Name”, “Region”, “Office”, “Sales ID” and “TotalAmount”.
We also have a list called “Sales orders” with three columns, “Product”, “Amount” and “Sales ID”.
In this list the column “Sales ID” is a lookup column to “Sales ID” in “Sales person”.
We also have a data connection to retrieve these three fields from “Sales orders”.
When we open a form for a sales person we want to see the total amount of orders that’s been made by that person. When we first look at this it looks quite simple. The “TotalAmount” should be the sum of “Amount” where “Sales ID” equals “Sales ID”, right?
The problem here is when we work with lookup columns it is not actually the value of the look up that is brought to your repeating table by your data connection, it is in fact the “ID” of the item in that list.
So to filter which amounts to summarize we should do like this:
The “TotalAmount” should be the sum of “Amount” where “ID” equals “Sales ID”.
Now when we open the form of a sales person, we could see the total amount that person has sold for.
Hope this helps someone!