New reports defined in Deliver are appearing in View under the name of UNDEF.
The client did not have the report in question defined correctly in the Deliver Job ("Reports for Job") definition.
The definition had a Stepname field of blanks, whereas the step in question was within a proc which is what should have been defined in the Stepname field. Having a Stepname and Procstep name follows what was in the job run, in the JESLOG, as both the Stepname and Procstep fields contained a value.
It was recommended to set the Stepname field to be the same as the proc name to fix this issue.