Hi Ken. Exactly my point.

To date there have been plenty of good arguments for each side and even some arguments that say "it depends". Still looking for a reference to some text on relational or n-tier theory that can settle this.

>PMFJI here, but I battle with this. How about an RI/business rule like this?
>
>"the line item must have an RI link to a parent Purchase Order IF it is a line item with a 'PO' billing code, but must have no link if it is a line item with a 'Time' billing code"
>
>That rule has components of both BR and RI - so - where does it go?