1991057 - "Invalid request initiation System" error from IdM

When a request is routed from NW IdM to AC10, customer is getting the following error message, found in VDS operation log:

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

SAP GRC Access Control 12.0

additional message, msgcode=4, msgdescription=invalid request initiation system, operation result: 82, GRC User Access Request:82:Script execution failed, fetch result code, GRC_REQUESTOR_INITSYSTEM, IDM 7.2, SAXOutputter.characters, VDS, operation log, reqinitsystem, putNextEntry failed storingcn, GRC_REQUESTOR_ID, DSE log,  Get Mandatory Parameters for Submit AC Request From VDS, operation.trc, GRAC_USER_ACCES_WS, REQ_INIT_SYSTEM, GRAC_IDM_SELECT_APPL_SERVICES, application inbound call, web service, identity management, idm, VDS operation log, msgtype=error, msgcode=4, operation result 82, LDAP , KBA , GRC-SAC-ARQ , Access Request , How To