You did not explain what situation you are seeing with your return so I am going to make some assumptions. If this is not your situation, please add more details.
If you are entering a Form 1099-R reporting a distribution from a Traditional IRA which has been converted to a Roth IRA and the distribution code is 7, then you should not be entering any information in the Roth IRA contributions section of your return. Entering a Roth IRA contribution is the only time that the Modified AGI for contributions would come into play. A conversion is not the same thing as a contribution and should not be entered as a contribution to the Roth IRA.
After the Form 1099-R has been entered, there are follow-up questions to answer which will ask what was done with the money. This is where you indicate that the funds were converted in part or whole to a Roth IRA. That's all you need to do to report the conversion. There is no MAGI limit associated with this.
Also, you should never change the Form 1099-R distribution code to be different than the form you received. That distribution code helps to determine whether the distribution is taxable.
@MarcV
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