Hi,
I guess that you missed to select the storage loc view while creating the material or you missed to enter the storage loc in the pop up. If you had selected it, system will ask for the storage location (not mandatory field) in MM01 itself. You may try to create a new material with the storage loc view and check the system behavior. Check the data in MM03. revert back if its not still not showing storage loc data in the view.
Regards,
AKPT