I just reviewed this with one of my customers. First, I had her add the withholding taxes that Aatrix is asking for. Then, we tested.
In Aatrix, the Filing State column (it's next to the column Box 18 CT Wages) is being populated with the vendor's state (those states are the ones Aatrix is asking to fill out tax IDs. We found this because the wrong format printed in box 17 in our test.). THAT is the column that is being printed to box 17 on 1099 and that box should be the PAYER'S state in the Payer's state layout, not the vendor's state. So, my customer changed that column to PA (her state) and everything seemed to print fine on the 1099's.
She had to get off the phone before all the testing, but I'm wondering if the ""fix"" is just to change the Filing State column to the Payer's state. Did anyone else see this?