Hi Janet,

Thanks for using Sage City.

You just need to make the change in Final Accounts Online, then generate the iXBRL again and download it so you can attach it in Corporation Tax Online. Once everything's saved you can attach the new set to the tax return for online filing, you can read more about that here: Attachments for online filing >

if this helps, please click Verify Answer.

Regards

Andy
Sage UKI