Matrix

Hi everyone reading this post!

I need help with creating a matrix with a calculated value in each cell.

What i want to achieve is to recognize the number of sales a kombination of two different items have together.

As an example, the table could be looking as below:

Orderno   item.no

And the result of the measure i would like to get from this table is as below, the bold numbers:

item.no

Thanks in advance!