Im separated & claiming 17 year old son as eligible dependant Its asking me to confirm if his income is 0.He had a small income where do i adjust this? Its defaulted to 0

I am claiming my 17 year old son as my eligible dependant, i am separtated.  I am getting an error since it is asking me to confirm that the dependant's net income is zero.  My son worked casually during the year and made $6000, where can i enter this info?  Its defaulted to zero and i can only answer yes or no when asks to confirm if his net income was zero.  So i answered no and gives me the error. Anybody with the same situation? Thanks.