To claim the UCCB income as your dependant's income:
In the navigation tab, go to Income > T-Slips > Universal Chlid Care Benefit, and answer Yes to the question, "Do you elect to include UCCB amounts in the income of the eligible dependant or child? Be sure to include this in their net income for the year.
For more info about warnings and errors: https://turbotax.community.intuit.ca/replies/3304767