Use transaction SE16N -> Enter the table name and press enter to read the fields in.
Then type &SAP_EDIT in the transaction area (as a function code) and hit enter. A success message displays saying "SAP Editing function is activated".
You can now execute the report and you can edit any field except the key fields.
Use with caution!!!
This is a replacement of the blog at [/people/kevin.wilson2/blog/2009/09/29/tip-editing-any-table-in-sap|/people/kevin.wilson2/blog/2009/09/29/tip-editing-any-table-in-sap] which has stirred so many great discussion points on security.