Deductions & credits

It is not the amount of interest I want to change, it is the average balance used to calculate the amount of allowable interest that can be claimed if your average balance is greater than $750K. I hate to change numbers on a 1098 that has been sent to the IRS. I would not know how to change the interest paid number to a higher number so that TT will reduce it to the correct allowable amount. What I can do is change the "Beginning Balance" reported on the 1098 to the correct "Average Balance" I want to use for the allowable interest calculation. That works because TT is using the Beginning Balance as both the Beginning Balance and the Ending Balance in the allowable mortgage interest calculation. This is not a good solution. Is there a better way of doing this without fudging numbers reported on the 1098?