I have a sharepoint subsite with a task list on it. I have created a workflow to set item permission on each task. Only the "assigned to" and a sharePoint group should have permission on the list item.

I am doing the following steps by using the sharepoint user management events

- reset item permissions
- add permission (assigned to and SP group)
- manage permission (to define the permission level)

it is quite strange because if my subsite - where the task lists exists - inherits permissions from the parrent site the workflow fails with the message "Server was unable to process request --> Diese Seite ist nur für eine WebSite mit eigenen Berechtigungen verfügbar"

this means something like: "it is only possible with unique permissions".

If I change the permissions from my subsite to have unique permissions then the workflow gets completed without any error.

Is this a known issue or only unique in my environment?

thanks

BR