Unable to restore DB

HI all! When I try to restore an SQL database on my desktop, this is the message that I get: --------------------------- Microsoft Business Solutions-Navision --------------------------- You cannot delete or change the type of the Aircraft Registration field (in the Job table) before the value in the field is reduced to 0 (zero) or ‘’ (blank) in all records. This message occurred because a nonzero value was found for the record No.=‘2003E024’ in company ABCD inc… --------------------------- OK --------------------------- What can be the problem? Hoe can I solve it? Thanks for help.

Ok guys! i just solved it. In fact, I forgot to restore in a new DB…[:(!]