[otrs] TimeAccounting 2.0.1 module does not update data in database

Hello I have the TimeAccounting 2.0.1 installed and I am able to create projects and task. I also can create users and when they are logging on they get the Timeaccounting-menu and all the pages. When someone is entering some time-date and he presses the Submit button, the page is refreshed and all data is gone. There is also no data in the table "time_accounting_table" Version of OTRS = 3.0.3 Regards Luc