Opening balance for Line 12b shows as zero, but when the column is totaled the program actually includes an entry for accumulated amortization. (A positive number here is subtracted.) I don't know why. The program shows no source for the cell. If I enter a positive number in this cell, it gets added to the sum. But if I enter a negative number (you're not supposed to) the hidden amount is no longer included in the total at the bottom of the column. Please check on this. It's a bug.
