DAX query to filter Invoices where at least one line item contains a particular product - powerbi

Question

I have an invoice table with columns including InvoiceNo and ProductID. I need to be able to filter so that it returns all Invoices that contain a particular Product. When this filter is applied, it needs to only display the invoices with that product, but it should show all products on that invoice.
For example, I have the following table:
InvoiceNo ProductID
111 ProdA
111 ProdB
111 ProdC
222 ProdA
222 ProdB
I only want to display invoices that have ProdC. When filtered, it needs to show
InvoiceNo ProductID
111 ProdA
111 ProdB
111 ProdC
I have tried the following DAX Measure:
CALCULATE(
COUNTROWS(Invoice),
SUMMARIZE(
FILTER(
SUMMARIZE(
Invoice
,Invoice[InvoiceNo]
,Invoice[ProductID]
)
,Invoice[ProductID] = "ProductC"
)
,Invoice[InvoiceNo]
)
)
But when I apply the filter (where measure > 0), it only returns the following
InvoiceNo ProductID
111 ProdC
If I was doing this in SQL, I would use the following query:
select
[InvoiceNo]
,[ProductID]
from
[Invoice]
where
[InvoiceNo] in (SELECT [InvoiceNo] FROM [Invoice] where [ProductID] = 'ProdC')
UPDATED: 19th July
A further complication is that we also have a Qty Column, which can contain the value 0. So an updated table would be
InvoiceNo ProductID Qty
111 ProdA 1
111 ProdB 2
111 ProdC 1
222 ProdA 1
222 ProdB 3
333 ProdA 1
333 ProdB 2
333 ProdC 0
I want to exclude Invoice 333 from my result, because while I am looking for invoices that contain ProdC, I only want them if ProdC qty is > 0.

Answer 1

This measure will do the trick
Active =
SUMX (
Products ;
CALCULATE(
DISTINCTCOUNT ( Products[InvoiceNo] ) ;
ALL ( Products ) ;
Products[ProductID] = "ProdC" ;
Products[Qty] <> 0 ;
Products[InvoiceNo] = EARLIER ( Products[InvoiceNo] )
)
)
First you make sure you perform the calculation on a row level with the iterator SUMX. This makes it possible to relate to the invoice number of that particular line and compare it against a filtered version of the product table based on product C and simply count the results.