I created a custom Visual Studio Workflow. It works fine and is a simple approval workflow.
There is a Workflow Task associated to a dynamic user and the user musst approve or reject it.
The Problem is, that the approving user can still access the form after completing the task and make changes...
I use the built-in approval form: <Task0_FormURN>urn:schemas-microsoft-com:office:infopath:workflow:ReviewRouting-Review:1031</Task0_FormURN>
So, even if the Task is completed, the approver can change the approval status of the item.
How to prevent him from that?