Displaying the Work Item Container 
Use
The contents of the container for the relevant work item are displayed in an overall view. You can see the current, runtime-specific data on the specific work item. A distinction should be made between the work item types for which the container is displayed:
The contents of the task container of the task represented by the work item are displayed.
The contents of the workflow container of the workflow represented by the work item are displayed.
Features
In addition to the fields defined and filled by the system, the container also contains any fields created during the definition and filled via a binding. A distinction should be made between:
Constants are displayed with their value at the time.
Object references are always specified starting with system and client. These are followed by the ID of the object type and the concatenated key of the object.
You can display the attributes of the referenced object using instance data details.