By default, Author or Contributor role doesn’t have permissions to edit another author’s post/page or publish content. In order to allow the user to be able to edit another user’s post/page or be able to save the post/page we need to give appropriate permissions. We recommend using the plugin – http://wordpress.org/extend/plugins/user-role-editor/ to manage roles and capabilities.
If you give the user “Publish post/page” permission, Oasis Workflow will show “Save as <Post Status>” button on the post. This will help the authors to save the post and be able to sign off the post after making changes.