Fix permission set when adding participants to a workflow

• i login and go to my personal workspace.
• select a document and click the tab workflow
• click Approval workflow
• click Approved (minor version)
• click start
• select user2
• select write
• select verification
• select a date and click add
• click start the workflow
• log out as user1 and login as user2
• Click on the task i got.
• In the tab workflow i select a other user to add him/her to the workflow (Select reviewers)
• select a user3
• select write
• select verification
• click Approve
• log out as user2 and login as user3

Trouble: No task displayed into the task list for user3

If I give Read access to user3 on the document, the task is visible.