HI
Make sure your masterdata 0MATL_GROUP is correctly mapped between the two cubes. If the masterdata in 0MATL_GROUp is matching the transaction in the cube then the nav attribute will show the values.
As a side note I wouldn't recomment to transfer inventory from one cube to another and rather directly use 2lis_03_BF as source for your ZIC_C03
hope that helps
Martin