Running XCOMJOB using:
//XCOMCNTR EXEC PGM=XCOMJOB,
Release : 12.0
Component : XCOM Data Transport for z/OS
For TYPE=SCHEDULE transfers, ALL retries are governed by the XCOM server’s FERL, SERL, TERL, AND VERL settings. Those settings CANNOT be overridden in the XCOMJOB TYPE=SCHEDULE job step. They are set in the server’s CONFIG member, a DEST member for the remote partner, or via an EXEC PARM for PGM=XCOMXFER.
TYPE=EXECUTE transfers can retry on a limited basis, meaning ONLY for initial session establishment errors. Other errors that occur after the connection has been made will not be automatically retried. SERL, TERL, AND VERL are used for those retries.
For further details please see related KB article: XCOM for z/OS retry functionality for TYPE=EXECUTE transfers