The ability to import referential integrity class is based on the ACTIVATION field in the HSURDRIA table located in the Data Express knowledge base. During the z/OS Host installation this table is not created in the knowledge base. It must be created manually in case the import type Referential Integrity in the Import Class window will be used. This way of handling automatic referential integrity has been chosen in order to prevent uncontrolled access to z-OS knowledge base from user interface, because the referential integrity process is a time consuming one and it can affect the z-OS performances.
CREATE TABLESPACE      HSURDRIA
       IN               &URDBASE
       USING STOGROUP   &URSGROUP
       PRIQTY         12
       SECQTY         12
       FREEPAGE       0
       PCTFREE        0
       BUFFERPOOL        &URBPTS
       SEGSIZE        64
       COMPRESS          NO;
 
CREATE TABLE &UROWNER.HSURDRIA
       FREEPAGE    0
       PCTFREE     0
       BUFFERPOOL    &URBPTS
       SEGSIZE     64
       COMPRESS      NO;
   
CREATE TABLE  &UROWNER.HSURDRIA
   (ACTIVATION CHAR(1) NOT NULL WITH DEFAULT)
 IN  &URDBASE..HSURDRIA;
 
CREATE UNIQUE INDEX &UROWNER.HSURDRIAX1 ON &UROWNER..HSURDRIA
 (ACTIVATION)
        USING STOGROUP &URSGROUP
        PRIQTY 12
        SECQTY 12
        CLUSTER
        BUFFERPOOL  &URBPIX;