I created 8 corrected 1099NECs. They printed fine except for the copy D, every third NEC amount prints not at the right, but in the center. Everything else looks correct. When the DAT file is created, apparently that same third NEC does not have the "corrected" box checked. I recreated the file three times and IRS FIRE rejected it every time.  I had to manually print the SSA copy of the NECs on red IRS forms, and that is when I discovered that the box was not checked on the third NEC. Just something that needs to be corrected. Mailing is a pain.