Are you the surviving spouse of the decedent? If not, the distribution from the inherited IRA is independent of the contribution to your IRA and the contribution to your traditional IRA is an ordinary contribution, subject to the contribution limits that apply to ordinary traditional IRA contributions.
If you are the surviving spouse of the decedent, perhaps what you did is a rollover to your own traditional IRA and you would indicate as such when entering the code-4 Form 1099-R for the distribution from the inherited IRA. (A non-spouse beneficiary is not permitted to do such a rollover.)
