When you file an SA100 with Capital Gains pages it is a requirement to file a backing schedule of the data as a PDF attachment.

If you have a brokers schedule you would attach this to the return through file / attachments / add.

If you do not have your own schedule you can use the CGT wizard within the return to populate the pages to then create the schedule for the submission. This is done by going to page 1 of the CGT pages and in the top left hand corner selecting CGT Wizard. Through this window you list out the disposals in the period. Once done the software will populate the CGT pages with the entries, and attach a backing schedule to the submission. The schedule can be seen via file / attachments / view.