[Koha] overdue + circulation

Hi i'm using version 3.2.1 i'm facing a problem in circulation page when patron has long overdue returun his books and he cann't checkout again couse this message Patron has had overdue items and is blocked for 32 day(s). and same problem when try to insert old check out with old date can't chech out couse this massege The due date "27/05/2009" is invalid .. any help that's important .. thanx John Smith International Library of Southiana IT Supports