DAX Funktion returns table with a calculated column

Hello!

I am struggling to find the right dax function for one specific problem:

I would like to write a DAX expression that returns a table:

Lets say I have a Master Data Table with all Materials.

I also hav a Transaction Table with all the Purchase Orders.

I would like to get a table with

Column1: Matrial ID

Column2: Number of Purchase Orders

It shoud consider all the currently active filters. So if the year 2015 is filtered it should only contain Materials which have Purchase orders in 2015.

I think basically the Summarize Function would do it:

SUMMARIZE(<table>, <groupBy_columnName>[, <groupBy_columnName>]…[, <name>, <expression>]…)  

 but actually i want to summarize any rows, but just want to get a filtered table with one or more calculated columns.

I couldnt find the right function for this. Any hints?

Thank you!