Lowell and Wayne - thank you for the leads. @lowell, yes those fields do exist (apologies for not providing a create table script) and your code is a great starting point. @Wayne, Thank you for providing a demonstrable example of null behavior - I'll be sure to experiment with this to learn and test these scenarios against what ever trigger I develop.

If I need more help, at least I'll have some closer to real code to post : ).

CB