copying a document to another library and incrementing version

Question

I have two document libraries, let's call them libDraft and libProduction.

In libDraft employees create procedures which eventually need to be copied to libProduction. I created a workflow in NINTEX 2007 which copies the document to libProductionand increment the major version (so the old file is saved in version control). Too bad this does not work. Instead of the document it copies the whole list item, so I always overwrite my old version and no version is getting saved.

Any idea's?

cheers