Each table that is SQL-able needs to have an AUTHID (Schema Authorization-id) .
SYSUSR and SYSADM are system authorization-ids that are created during the Datacom installation .
This article explains how an AUTHID can be added in batch.
An AUTHID can be added by running DBSQLPR using SYSIN card CREATE SCHEMA AUTHORIZATION name ;
or by running DDUPDATE
-USR DATACOM-INSTALL,NEWUSER
-BTG AUTHORIZATION,name
1500 AUTH-USAGE,S
-END
-UPD AUTHORIZATION,name(0001),PROD
-END