Good Morning

The Roth IRA was inherited November from my clients Mom .Schwab distributed 50% to each heir.  My issue is the box is only marked with a T and not a 4 yet it clearly states it is for a beneficiary as it is stated in the recipient as Roth bene of Debra. The 8606 is only for my clients contributions and his basis should not be affected . I am trying to get the distribution of his Moms Roth IRA from carrying to his 8606. I just don't know how to override the 8606 in the software.