Author X recently published a paper in Journal Y and has asked for the paper to be retracted. The reason given is that part of the data presented in the paper was published without the permission of a colleague, who is not listed as an author of the paper (and probably does not qualify for full authorship). This colleague is now seeking to publish the data in another journal and it is implied that Author X is also a co-author on the second paper (which has been submitted, not yet accepted).