What is the Entity Type for Notes field

Question

I am trying to Update a Notes Field of a Task in project online. It gives me an error

Incompatible type kinds were found. The type 'Edm.String' was found to be of kind 'Primitive' instead of the expected kind 'Entity'.

Does anyone know what is the Entity Type of Notes?

Answer 1

What is the Entity Type of Notes?

Task notes are stored as RTF (rich text format) binary data . So its Entity Data Model should be Edm.Binary rather than Edm.String

For more details check Entity Data Model: Primitive Data Types

[Update]

Based on this Microsoft Article Task notes is a read-only field that is entered via Microsoft project and stored as RTF (rich text format) binary data, so you can't update it.