Generally, on the 1099-R the code P indicates "Excess contributions plus earnings/excess deferrals (and/or earnings) taxable in 2018", and you will have to amend your 2018 tax return to enter the 1099-R unless you already had "created" a 1099-R when you filed your 2018 taxes last year.
In 2018 the IRA taxable amount would be on line 4b (15b is for years prior to 2018).
Since your 1099-R has $0 in box 2a it will not change your taxable amount on your 2018 tax return. Any amendment would be only informational.
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