The CICS CANCEL statement cancel interval control requests. This statement can cancel a previously issued DELAY, POST, or START command. The effect of the cancellation varies depending on the type of command being canceled:

• A DELAY command can only be canceled before it expires. The REQID of the suspended task must be provided.
• If a POST command is issued by the same task and needs to be canceled, there is no need to specify a REQID. However, if the POST command was issued by a different task, you must specify the REQID associated with that command in order to cancel it.
• To cancel a START command, you need to provide the REQID linked to the original command.

Syntax -

EXEC CICS CANCEL
     [REQID(name)]
	 [SYSID(system-name)]
	 [TRANSID(name)]
     [RESP(response-field)]
     [RESP2(response-field2)]
     END-EXEC.

• REQID(name) - Specifies a unique name (1–8 characters) to identify a previous command.
• SYSID(system-name) - Specifies the system name to which the request is directed.
• TRANSID(name) - Specifies the transaction used to determine where the CANCEL command is to be executed.
• RESP(response-variable) - Optional. It captures the response code of the CANCEL operation and used to check if the command executed successfully or encountered an error.
• RESP2(response2-variable) - Optional. It captures the response2 code of the CANCEL operation when the error occured.

Short Examples -

Scenario - Cancelling a transaction when the error occured.

...
DATA DIVISION.
WORKING-STORAGE SECTION.
01 WS-TRANS-ID    PIC X(4)  VALUE 'TRN1'. 
01 WS-RESP        PIC S9(4) COMP.

PROCEDURE DIVISION.

    EXEC CICS START
         TRANSID(WS-TRANS-ID)
		 SYSID(WS-SYS-ID)
		 AT(WS-TIME)
		 REQID(WS-REQ-ID)
         RESP(WS-RESP)
         END-EXEC.

    IF WS-RESP = DFHRESP(NORMAL) THEN
       ...
	ELSE
		EXEC CICS CANCEL
			 TRANSID(WS-TRANS-ID)
			 REQID(WS-REQ-ID)
			 RESP(WS-RESP)
			 END-EXEC 
	END-IF.

	...

The transaction ID TRN1 is specified. START initiates the transaction asynchronously. If the command execution is unsuccessful, cancel the transaction execution.

Error Conditions -

Eror Condition	RESP	RESP2	Reason
NOTFND	13		Occurs if the request identifier specified fails to match an unexpired interval control command.
SYSIDERR	53	130	The SYSID name specified is neither the local region nor a remote system or the link to the remote system is closed.
ISCINVREQ	54		The remote system indicates a failure that does not correspond to a known condition.
NOTAUTH	70		Occurs when a resource security check has failed on the specified TRANSID.

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