By dropping the number "4" you are changing the number on your 1099-R, a copy of which goes to the IRS. This may be immaterial but the disparity could also trigger some sort of review of the return. To my knowledge, the workaround I suggested--simply telling the Turbotax step-by-step "interviewer" that there is no RMD for the account--does not misrepresent the information on the 1099-R or otherwise result in any misrepresentations on the final tax return or accompanying forms, and properly reflects the amount of tax owed (i.e., without an erroneously generated underpayment of RMDs penalty).
