Sorry Johnnie, no way to configure an alert if a new asset is added with a duplicate ID or serial number. Also, there is no ability through the application to make the asset ID + serial number combination be unique. Sounds like good candidates for new Ideas on the Communities though.
Johnnie, Moving this discussion from Product Ideas Forum, which is focused on how our Ideas process works, to Track-It forum to make it easier for the community to find it.
If you wish to create and Idea for the functionality please create the Idea directly within the Track-It Ideas content: