As long as you have included the 1099K income in your sales totals on your SCorp return, then you do not need to enter the 1099K again. TurboTax Business actually notes this at the top of the screen where your sales receipts revenue is recorded. See the sample screenshot attached.
Just keep the 1099K for your files and be able to document that the 1099K amount is included in your sales amount reported on your return.
