Assume that you've created a DC under a activity Act1 and noticed that the DC is corrupted. So you started from scratch and created a new DC with a New activation request Act2. But somehow, you've included some files of new DC into Act1 and by mistake you've already released the Act1. But as first DC is corrupted, activation fails for Act1. And new DC's activation request Act2 requires Act1 as predecessor.
Question is how to delete the activation requst Act1 and save Act2. Act2 also contains files included in Act1 by mistake.