Importing a page doesn't display in the history of that page

Hi,
I did import a xar containing a Main.Macros page in XE.
The process went well, but in order to rollback to the previous version, I went in the history, and I noticed that this import action didn't showed up here : it contains only one version (this one : 1.1 Administrator 27/11/2008 18:07, although that the content of the page is the one I imported...). See xar attached.
I should be better to take it in account, in order for administrators to have more security.

WYT ?