Hi,
In my app, item price is determined by couple of criteria, such as

1. is it promotion item?
2. is it sold to member?

and etc

I want the "correct" price shown immediately after user select from combobox. Am i break the 3-tier rules if I issue REPLACE price WITH xxxx in combobox.interactivechage? Any other better place to do these, in bizobj, .. ?

Thank you