Okay, I was steering you wrong. I was getting mixed up with assembly members. You need two separate repeat regions. (The first article you listed explains this.)
The cell value for both repeat regions is the same, &fam.inst.param.value.
The filter for the first cell is &fam.inst.param.name == PN
The filter for the second cell is &fam.inst.param.name == d516
The only concern I have with this method is that the two columns are completely independent of each other. If you choose to sort one of them, the other one won't track it. You might be better off creating one large repeat region that has two smaller ones inside it (each with separate filters).
