This is for Ontario returns.
Thank you so much for the most recent update that pre-populates box 61020 presumably if there was data relating to rent or property taxes in the prior year.
I have always used a manual memo in that ON-BEN form that says “Remember for next year” so that I wouldn’t forget to enter rent or property tax info for those who may qualify but the newest update flagging a diagnostic message on box 61020 is excellent. I no longer need to use memo’s to help me remember.