I have been trying to wrap my head around the concept of "Pin Sequence Numbers" in PADS DX Designer VX.2 Integrated Library and it doesn't make any sense. I put my thoughts and findings in attached PDF document. My conclusion is that the "Seq." column in the "Pins" tab of the PADS DX Designer VX.2 Integrated Library part editor is totally redundant and does nothing but create extra work for the librarian (especially for large parts like FPGAs) and cause confusion. I welcome any clarifications/comments on the subject. I have also contacted Mentor support and will post their response.