Hi there, I understand that the input character set for Segment mapping Algorithm is US-ASCII 7 bit Alphabetic characters (letters and numbers). Which includes !@%^ etc. Why does the masking fail when special characters are encountered? Also I am trying to ignore the 1⁄2 in one of the columns, which is not from the above character set, is there any way of doing this? I am using ALPA-NUM segment mapping.