The unload data set contains header records that record the characteristics of the source PDS or PDSE which was unloaded to create the data set being processed as input. This message informs you what they are.
The severity is 0.
Processing continues.
Refer to this information if you need to resolve DCB parameter conflicts with the output data set. Appendix B of the z/OS DFSMSdfp Utilities book has details about the header records content.
DFSMSdfp