I have a very similar error.
I did fill some income in the "Other income sources", but it is not reported in the TP-80 form.
Tried filling just the "Amount" box, checking the "Use Value from Federal Return" box, and filling the "Quebec only" box, but I still get the error.

Could it be the error is because of the 0 value?

If I manually add the income in the TP-80 form (line 110 and line 120), then I get the error "You preformed one or more overrides that have made your return ineligible for NetFile Québec. You must remove (cancel" these overrides in order to use NetFile Québec. If you choose not to remove them, you must send your return by mail"

Any advice?

@cpoll Are you reporting a business loss or zero income/zero expenses?

@Thisama Did you enter "Other income sources" for line 13000 on the T1, or "other income" in Part 3C the T2125? Did you have a business last year and transfer your info to this year?