How To Fix SF617 - Notes can only be entered for module class "CHAP"

SAP Error Message - Details

• Message type: E = Error

• Message class: SF - SAPfind: Message Texts

• Message number: 617

• Message text: Notes can only be entered for module class "CHAP"

What causes this issue?

You tried to create a note for a structure entry which represents
either the main chapter of the book, or a sub-structure. Notes can only
be made for the chapters below the main chapter.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.