After disabling the time tracking and enabling time tracking again I get the next error in the Human Resource module my current timesheets. 

Uncaught TypeError: obj is not a function

http://<host>/web/webclient/js?db=<db>:3499

When I enable it, the setting is set back (disabled), but the record in the DB is set. 

Some help to solve this issue is welcome.

OpenERP Version 7.0-20140102-002458.