Robert_Charlton - 8:57 am on Jan 27, 2013 (gmt 0)
Hi Dirk, and welcome to WebmasterWorld.
I've got to confess I can't understand what the situation is. Your original title was "Rename the same page", which wasn't very descriptive for me, so I took a guess and changed it to what I thought might be more descriptive (in less than 70 characters).
What kind of page is this? What kind of interaction is the user having with the page? Why is the user entering data? And why are you changing the url because of this?
It sounds like this might perhaps be something like a page that is accepting a single comment from a user, but otherwise the bulk of the page is staying the same.
Please elaborate, if you can, using generic words like "widget", etc, if you need to instead of specifics. Right now, I simply can't envision what's going on.