The issue was caused by the single letter in header, which is expected to be captial as per standard: http://www.simplesystems.org/users/bfriesen/dpx/S268M_Revised.pdf
The issue was caused by the single letter in header, which is expected to be captial as per standard: http://www.simplesystems.org/users/bfriesen/dpx/S268M_Revised.pdf