You can use the SQL to extract data from the CA 7 database. This sample SQL control statements will list all jobs that have dataset predecessors.
SQL statements:
SELECT SUBSTR(SUCC_OBJECT,1,8) AS JOB,
PRED_OBJECT AS PREDECESSOR_DATASET FROM CA7_REQUIREMENT
WHERE DB = 'yourlogicaldb' AND
PRED_TYPE = 'DSN'
ORDER BY JOB ;