KS3A606E Line [linenumber] contains an invalid SMSSTGRP. The group [groupname] with the invalid SMSSTGRP was not added.

linenumber

Explanation
 The specified line in KDFDUDGI contains a SMSSTGRP
that does not meet specifications. The group associated with this
SMSSTGRP will not be migrated.
System action
 None.
User response
Ensure that the SMSSTGRP is not blank.