RDF tables disappear during IPL

Document ID : KB000093016
Last Modified Date : 26/04/2018
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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. 
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.