The RELOAD step requires a subschema which describes the database structures of the database to be reloaded.
The subschema load module must be available in the RELOAD step.
Such load module resides in the DDLDCLOD area of a dictionary or (after being punched and link edited) in a load library. At least one of these must be accessible in the RELOAD step.
In this particular case, the subschema load module was not punched/link edited, and the DMCL used for the RELOAD did NOT include the dictionary segment in which the subschema load module resided, hence the 1474 / DB347003.
a) include the dictionary segment into the Reload DMCL
b) punch and link edit the subschema load module and ensure that the load library is defined in the STEPLIB concatenation of the RELOAD job.