Check your metadata
In order to avoid incorrect metadata in the DoKS harvester (and in your advanced search interface), it is important that administrators check their own metadata. This is easy: just go to the advanced search interface and open the lists behind Publication date, Department, Discipline, Degree name and Degree level. Make sure you use consistent metadata. If you notice a mistake, highlight the term and click search. Now you get a list with records where the field is incorrectly filled in. Edit the record(s), save it (them) and check the advanced search function again to see that the inconsistencies are gone. The problem with typos occurs mostly if records are added manually. Try to automate things as much as possible and import your data!