Here he solution:
You must start a new Backup Chain
If you go to Backups-> Disk, right-click on the disk backup job, then select "Remove from backups", it will remove the backup from the list in Veeam. This would not delete any of the existing disk backups; they just wouldn't be connected to the backup job. You would then go to Backup Infrastructure-> Backup Repositories, right-click on the repository where the disk backups are stored, then select Rescan; the disk backup should now show up under Backups-> Imported.
When you run the disk backup again, it will start over with a new full backup. The tape backup, in turn, will back up that full without worrying about the previous restore points.