Yes, CA JCLCheck can validate SCHID for CA 7 with the use of CA7 option.
CA7(10) will validate #JI,ID=010 statement for SCHID.
CA7(0) will validate all the different SCHIDs found in the #JI and JEND statements in theJCL. If there are 3 different SCHIDs found, CA JCLCheck will produce a separate report for each SCHID. You will also see the message, CAY6645I PROCESSING FOR CA 7 SCHEDULE ID '003'.