An attempt was made to remove an image mode volume or volume copy that is the target of an active (copying) FlashCopy mapping. While the FlashCopy mapping is copying, the data on the image mode mdisk might be different from the data on the image mode volume.
Wait for the FlashCopy operation to complete, then retry the command. Alternatively, specify the -discardimage parameter to force the delete operation, which might result in data loss.