Sale of rental asset worksheet

I sold a rental home. One of the assets associated with the house was a patio I had installed in 2009. I took a section 179 that year. In filling out the disposition of the patio, it correctly indicated the amount of 179 deduction I took in 2009, and the total depreciation taken thus far. But when I check my return, I get a "check this entry" that says eligible sec 179 should be blank because it only applies to current year. But TT clearly stated that I had taken the sec 179 in 2009, not this year. I had other assets (appliances, etc) that I filled out in exactly the same way, and none of these triggered the same message, even though I had taken 179 on all of them.