RDF tables disappear during IPL

Document ID : KB000093016
Last Modified Date : 26/04/2018
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Issue:
Upgrading OPSMVS from version 12.1 to OPSMVS ver.12.3 with ZOS 113 at our DR backup site. During IPL all of our RDF tables did not show up. I displayed at the panel 2.6 from OPSVIEW primary Options Menu and it shows up with 3 tables only. And at our Production System shows 76 tables. 
Resolution:
The RDF tables reside in the SYSCHK1 dataset. During upgrade from OPS 12.1 to 12.3 the same SYSCHK1 file must be used or a copy of the old file.