Make sure to Activate Capital Gain via Financial Image
Entering CGT Manually for Net loss
Use option A to fill the form manually i.e. single gain/(loss) values.
Use option B to fill the form with granular detail i.e. buy/sells & their respective dates.
Learn more from this guide Capital Gain Tax (CGT) Worksheet
Other Related Article:
Capital Gain tax (CGT) schedule - Main residence exemption and Partial Exemption