Turbo send me your question. It looks like you're not getting any answer as well. Turbo support really sucks. anyhow I know the answer to your question so I will help.
Your income will not be duplicated. Don't worry. Just entered the self-employed income on the T4A form and that amount will be transferred by the software to T2125. You don't enter the amount again in T2125. Good luck.
