The correct action is to report the income once on your tax return. However, to make a clean sweep so that all of the income is reported, (no question from IRS about missing income), then you can choose to enter the income from both vendors. Take an expense deduction for the amount that is duplicated as some others mentioned.
The key is to keep all of the documents with notes in a safe place along with the tax return so that you can explain it all down the road, should you ever need to.
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