If the filing status of the return is married filing jointly and Form 1040, 'AdjustedGrossIncomeAmt' plus (+) Schedule 1 (Form 1040), 'StudentLoanInterestDedAmt' is greater than 170000, then 'StudentLoanInterestDedAmt' must be zero if an amount is entered. If this the case, simply remove the amount from the Student Loan Deduction Amount.