Of course I don't know your data as you do, but.... I must stress my point here.

I just want to make sure that you do realize that by doing this update, you will create a new instance (eg row) of the entity (in table) that previously didn't exist, and also by doing so, you will delete an existing instance of the entity, thereby changing the fact that it has ever existed, along with it being the 'parent' of several rows that I suppose have some relation to each other (the order differs only).

The point I'm trying to make is that you want to change the PK for some, but not for all of the registered and currently related asset records. This seems a little strange to me, that's why I'm, asking. I want you to be sure that you're not doing anything you'd later regret..

/Kenneth