Angularjs Repeat Table Rows Inside Rows

I've read a few existing threads on this topic and I think I'm close but I may need a bit of help. I'm trying to display line items for purchase orders. If the row in line items ar

Solution 1:

It always helps to put my question in writing. As soon as I posted it, I think I figured out a solution. I'll add rowNumber column into the stored procedure returning line items and will display that info only when Rn = 1.

I made it work although I could not make the original odd/even rows backcolor. Now all "header" rows look like even, which is probably an OK effect.