In the IDMS startup JCL, ensure that the library containing the Startup Module, RHDCTCKR, and RHDCCKUR is the only library specified in "STEPLIB".
Why can't I have more than one library on the STEPLIB?
Your startup module, RHDCTCKR and RHDCCKUR are the only things IDMS normally loads from STEPLIB. As of IDMS 4681, IDMSUXIT will also be loaded from STEPLIB if it is found there, otherwise it will be loaded from CDMSLIB.
Every other module is loaded from CDMSLIB.
You can have more than one loadlib in CV startup STEPLIB, but you must be sure that any loadlib in CV startup STEPLIB must be APF authorized.
The entire STEPLIB must be authorized in order to maintain the attributes defined in the PPT entry (most importantly the KEY specification).