Thank you Mike! I think I've got it now... When entering the cap gain on form 8949, it does transfer to Schedule D as you indicated... So the capital gain/sale is recorded in form 8949, then reflected in Schedule D (capital gain), and finally the sale is also reported on form 8594 by both seller and buyer (and must match amounts by category), and is generated outside of TurboTax. The latter meaning the return has to be physically filed with the IRS...
