Over the years Note Assistant tool has seen many improvements and bug fixes. These changes are delivered via composite Notes, delivery of set of individual Notes happens by this.
Depending on your release select the below listed composite Note :
1668882 - Note Assistant: Important notes for SAP_BASIS 730,731,740,750,751,752,753,754
875986 - Note Assistant: Important notes for SAP_BASIS up to 702
The below Note is specific to Digitally Signed Note Implementation :
2869143 - Composite note for Digitally signed note download (Implement this on top of above enablement Note(s))