Unable to Edit Defect nor User Story

Document ID : KB000094710
Last Modified Date : 18/05/2018
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User who has got the edit access to certain Agile Central projects can't update the Work Items (User Stories/Defects/etc.) however the very same user is able to update tasks which are in the same projects.
The User had a Viewing mode by default switched on which would make EDP pages non-editable while QDP pages (where Tasks were opened) can be still altered (https://help.rallydev.com/new-quick-detail-pages-beta).