Error on Form 6252 Installment Sale Income for Estate Return 1041

I am the executor of an estate that received income from an installment sale of the decedent's farm including primary residence. In years prior to the decedent's passing, they filed Form 6252 with their Form 1040 return. I am doing the estate's taxes using TurboTax Business 2019 to file the Estate Return Form 1041. 

 

The program is giving an error on Form 6252 saying that line 15 ("If the property described on line 1 was your main home, enter the amount of your excluded gain. Otherwise, enter -0-") should be blank.  But since it WAS their main home when they executed the installment sale, they entered a non-zero value on that line in their tax return the year the sale was made (this affects the Gross Profit Percentage, line 19).  Is the program in error in saying line 15 should be blank? The property was farming property (hence I selected 3, Farming Property, for the property type code on line 1) that included their primary residence/main home, hence they have excluded gain for the value of the home.

 

What do I have to do to fix the error?