Recently I ran into this error message when creating and saving a new version in DRM.
The server returned an error processing the action: CloseJob Error message: DRM-14090: Cannot mark version <id number> as deleted. It does not exist in the repository.
When we first encountered the erorr I did some searching and saw that a few people recommeded checking database tablespaces. Ours looked fine but we went ahead and increased the size of the data and index anyway. Unfortunately this appeared to have no effect.
After a while I ran across a post suggesting that we unload and reload the current version prior to saving. In my mind I thought there is no way this could be the answer but gave it a try anyway.
Well I was wrong unloading our current saved version and reloading it prior to copy and save seems to have done the trick.
Hopefully someone else will find this information useful.