Generally that is a problem of the order in which you import the tables. Import the main table first, then the related table and the problem should go away, unless you are letting the system create it's own identity values inwhich case they may not be the same as the ones in the production tables and thus the related records will not match up. Usually if I am importing data from production back to development or testing, I will enable the identity insert on so I get the same identity values in all the tables that production has, making it less of a problem to import related tables. That is an option even using the wizard if you look at the actaul transformation.