[Zope] version deleted but there is still a version lock

I have a Zope folder which contained a version a long time ago. The version was deleted, but in the management-screens I always get a version lock. I cannot add documents, and I cant change a few of the existing docs. How can I make my existing objects notify that theres no version anymore and therefore no locking necessary? Unluckily this happened with a projectsite we have on the net. There are a lot of people waiting to see new content which I cannot add.... yours, andy ap@net22.net