Farm client installed drain tile on farmland which is a 15 year asset qualifying for Section 179.  I get a diagnostic saying invalid method for Sec 179.  Previous answers indicate check the box for qualified leasehold improvements, which certifies that it is a 39 year property.  this isn't 39 year property entered with method code 87. It is 15 year property entered with method code 66.  How do I enter this to get the sec 179 deduction?