If you are Self-Employed, all of your income is considered to be earned from your Home Office in your Resident State.
If you went to a client's site in Nebraska to oversee or perform work there, you don't need to file a Nebraska return, just report all your income to your Resident State.
You could add the income you received for Travel Expenses to your income on Schedule C, then deduct the corresponding expenses against the income.
Click this link for detailed info on Reporting Self Employment Income and Expenses.
[Edited 3/10/2020 | 3:13 PM]
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