In general, If any Docuemnt CALs are not assigned to document, that tab will not be shown.
This means all your doc cals consumed.
No more doc cals available to allocate.
You need to free some cals from the existing document.
there may be two reasons for this
1. There is no Cal assigned for this document
2. there are cal assigned but they are consumed .you need to release them .if there last access time is more than
3. restart management console service
Retrieving data ...