Social Benefits Repayments - how to enter


I made $3,000 in social benefits repayments in 2023 (for social benefits received in 2022) 
There is no T5 because I did not receive benefits in 2023.


I see in the deductions summary a listing for "Social Benefits Repayments",  however there seems to be no way to change the amount from $0.  Where and how do I enter my repayments?