A customized build did not start because an older version was requested. This did create a Build Entry. Then an option that appeared to remove this Build, was selected. It asked the question "Do you want to remove all logs ?" Upon choosing Yes here, made the entire Branch to disappear from Bamboo, not just that Build.
The Branch, however is still present in BitBucket and SourceTree, but can't be seen in Bamboo. Can the Branch and its Build History in Bamboo, be recovered at all ?