How to delete the system generated notes through toolkit?

Hi everyone,

Does anyone knows how to delete or remove the system generated notes.
I tired the APIs,

ProDtlnoteRemove() - failing

ProDtlnoteDelete()  - failing

ProDtlnoteErase() - erasing note until next regeneration

these above API are removing all the notes except the system generated note (for eg: scale 1:1, section x-x).