Juan contacted me offline and we resolved this. SUM FIELDS=(30,4,BI) was being used with a 4-byte ZD field in 30-33 (C'0001') so all of the X'F0F0F0F0' binary values did indeed overflow. Changing the SUM statement to SUM FIELDS=(30,4,ZD) gave Juan what he wanted.
Frank Yaeger - DFSORT Team (IBM) Specialties: ICETOOL, IFTHEN, OVERLAY, Symbols, Migration => DFSORT/MVS is on the Web at http://www.ibm.com/storage/dfsort/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html

