Hmmm...
So in my case where my source data is
[productID]{tab}[Price]
In the destination data area, I would place a check mark next to productID in the Key field and check the Update Key in the mapping screen?
In case you haven't noticed, I'm one of the people that was attracted to your statement:
This version was especially designed for none technical people.
I know what SQL stands for, and that's about it.
Todd