I have built an accident reporting system in SharePoint 2013 and I'm having one last problem that I can't resolve.
The nature of the item data means that it needs to be tightly controlled so I have set the item level permissions to 'Read items that were created by the user' and 'Create items and edit items that were created by the user'. This means that only the user and those in the site owner group can see the item.
There is also a need for the manager identified in the report to see the item however granting permissions for the item to an individual user (Items -> Shared with -> Advanced -> Grant Permissions) doesn't seem to work as they get the 'Sorry something went wrong' page.
Does anyone have any idea what I'm doing wrong?