You recieve below error while fetching notes/attachments for an object from Odata Service:
The Data Services Request has been understood but is not supported by the processor
Reproducing the Issue
Use following URL:
Direct entity set read of TextCollection/Notes and Attachments is not supported.
Attachments and Notes are attached to an object (Master/Transactional) and should be read with reference to that object via navigation.
KBA , LOD-CRM-EMP , Employee , How To