WHYFLAGS for diagnostics on SMS managed data sets are not displayed in the logs.
Release: Disk™ Backup and Restore
Uncomment the SMSPRINT DD on any IXMAINT job, diagnostics will be displayed called WHYFLAGS. The WHYFLAGS give information on the decision that was made for each data set in the IXMAINT run. (KEPT or DELETED) This can be very helpful when setting up SMS rules. The WHYFLAGS and the SMS attributes honored by IXMAINT are documented in the Disk Tech Guide.