Summing transactions using DAX functions in Excel PowerPivot

Question

I have a table in my PowerPivot data model called Orders which stores all our order records, each row is a unique order record and their are no duplicates.

I have a second table in my data model called Transactions - this table does not have any unique columns however it does have a column called 'OrderID' which is related to the orders stored in the 'Orders' table. A single OrderID may have multiple transactions against it.

I want to add a calculated column to the Orders table which sums the value of all the transactions in 'Transactions' which have a 'OrderID' equal to the 'OrderID' in 'Orders'

Before I was using PowerPivot this was simple, I used a SUMIFS function, this however is not available in PowerPivot, and building a relationship between the two tables does not work because their are multiple transactions for each Order.

Can anyone recommend I can achieve the same SUMIFS result in PowerPivot using a DAX syntax?

Thanks.

Answer 1

I'm updating this to say that I was being a complete muppet. The reason that my relationships weren't working was because my column headers had somehow been duplicated and was appearing a record elsewhere in the table.

As soon as I removed this and created a relationship between the tables as above and the PivotTables worked absolutely fine.

Apologies for wasting anyones time.