Unique keys are the only fields retrieved from path and auxiliary records and are, therefore, the only fields that can be used to join tables. In cases where the uniqueness of an Auxiliary record depends on a record above it hierarchically, the table procedure developer should add OBTAIN OWNER code to the COBOL source to retrieve the unique key for that record. Then the developer should update the linkage section of the table procedure program and the CREATE TABLE PROCEDURE statement to include any new columns in the table/linkage section.
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