Endevor CM Enterprise Workbench fails logon.

Document ID : KB000030503
Last Modified Date : 14/02/2018
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Logging on to CMEW after upgrading to Endevor release 16.0 or higher may fail.

Error: BnSession.hookTask() Error: Login error RC=0016,RE=0002:0
Unable to retrieve Error Messages - Error: EAPI3174E rc=-425 prc=0008, CCILOGICERR, src=0034, CCIRTMOUT, F record, getdata failed :99

The spawned task is failing with security error on temporary dataset for ddname APIMSGS::

ICH408I USER(<ID> ) GROUP(<GROUP> ) NAME(<USER>)
SYS.D#####.T#####.#####.APIMSGS CL(DATASET ) VOL(vol)
332 DEFINE - INSUFFICIENT AUTHORITY 

Solution is to modify the C1DEFLTS parameter MODHLI to change the hlq of that dataset.