Why does box 118 of a T5013 not flow through to the proper place on the tax return automatically? I have ignored this box in the past assuming it was "information only".

Most other boxes on the T5013 flow through to the tax return automatically so I have always ignored box 118 assuming it was either not appicable or for information purposes only.  I'm now seeing that I should have been including it on line 162 Gross business income.  Why then doesn't turbotax allow it to flow through automatically.