Hi,
This sure looks corrupted. I checked our ECC EhP7 system and the function module SUBST_START_BATCHJOB has only 281 lines. The last two ENDIF's from you screenshot should finish with an END FUNCTION.
If this is a non-production system, can suggest removing the additional junk characters and proceeding with the upgrade. If this is a production upgrade, please raise it with SAP.
Regards,
Srikishan