Custom filed in RTC
One answer
As of today, you can't. Apparently they should be hidden, but this does not always happens.
See:
https://jazz.net/forum/questions/135803/deletion-of-custom-attributes
https://jazz.net/forum/questions/32916/how-to-remove-custom-attributes
https://jazz.net/forum/questions/70775/how-to-delete-an-attribute-definition-from-a-project
See:
https://jazz.net/forum/questions/135803/deletion-of-custom-attributes
https://jazz.net/forum/questions/32916/how-to-remove-custom-attributes
https://jazz.net/forum/questions/70775/how-to-delete-an-attribute-definition-from-a-project