If you withdrew your excess contribution together with its gain/loss before April 15, 2016, you should have received a form 1099-R with code P in box 7.
You do not need to enter this form 1099-R on your 2016 tax return as code P indicates a previous year.
As you had a loss on that excess contribution, you do not need to amend your 2015 tax return as there is no income on that excess contribution to report. Your loss is not deductible as you still have balances in your Roth IRA.
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