Self employed

No, do not enter it in both places.  You can enter the income from the 1099-K directly on your business/self employment activity.

 This will be added directly on the business/self employment section.

1. Search > Type schedule c > Click the Jump to... link > Edit next to your business > Scroll to 'Add income for this work'
2. Select Other self employed income , includes cash and checks > Continue > Enter description and amount
3. See the image below.