In ZMF 8.1+ all references to the temporary CMNBAT90 control file (&&BAT 90 CTL) were changed to consistently specify BLKSIZE =0. However, some customers have retained customisations in those skels, or are using other skels based on the old format, which result in a mixture of BLKSIZE=0 and BLKSIZE=3200 being specified for the same &&BAT90CTL file within the same staging jobs.