wordpress cms to vBulletin suite: importcontentid
 

I am making a few tests to import all wordpress articles to vBulletin CMS. So far, all datas are correctly collected and inserted in the database but there is a problem with the importcontentid.
If I check the table cms_article, I see that all imported datas have the same importcontentid = '0'.
I think it is supposed to take the id of the source cms (here wordpress) to unable easy redirection when everything is done.
Am I missing something or is this a bug?