When you have none ISRC's (a unique code for each individual track) or UPC (a unique code for the entire release), that's no problem: these codes are automatically assigned to your release after it is sent to the stores.

Do you want to start using your own set of ISRCs? You arrange that via SIGN: isrc@sena.nl.

If you do have ISRCs and / or a UPC, enter this in the correct place in the title information.