# System Fields Used as Property Fields

An output or input user application message can contain Substation ES information in system fields. You can configure Substation ES to pass system fields for use as property fields.

System Fields in Properties
Property Name | B/E/V | Value | Function
--- | --- | --- | ---
`jmscorrelationid` | B | Buffer Field Name | Puts the buffer field of the Trigger outgoing message in the correlation ID.
`jmscorrelationid` | V | $$envelope | Puts the envelope token in the JMS Correlation ID of the Trigger outgoing message, rather than in the property field called tibss-envelope.
`jmscorrelationid` | V | Text | Puts the text value specified by the user into the correlation ID.
`jmscorrelationid` | E | Buffer Field Name | Puts the correlation ID of the incoming message in this buffer field location.
`jmsmessageid` | E | Buffer Field Name | Puts the message ID of the incoming message in this buffer field location.
`tibss-BES` | E | $$SYSTEM | Sets the name of the back-end system to be used. The name entered must match one of the CICS or IMS names, as specified with the INTF_ID parameter.
`tibss-BES` | V | $$SYSTEM | Puts the name of the back end system on the outgoing message as a property, `tibss-BES`.
`tibss-envelope` | E | $$SYSTEM | Looks for the property `tibss-envelope` and places it in the message token area, which is used in BES for Request/Reply events. The recipe response message automatically adds the property, `tibss-envelope`.
`tibss-envelope` | V | $$SYSTEM | Puts the Substation ES back-end system context information on the trigger’s outgoing message as a property, `tibss-envelope`.
`tibss-MFS-Name` | E | $$SYSTEM | Sets the IMS MFS map name to be used. Specify 1 to 8 characters.
`tibss-password` | E | $$SYSTEM | Sets a password from the message to the back end system.
`tibss-resource` | E | $$SYSTEM | Sets the resource name for the back end system.
`tibss-rro-sysid` | E | $$SYSTEM | For the CICS back end. Sets the remote system ID when using CICS MRO.
`tibss-rro-tran-code` | E | $$SYSTEM | For the CICS back end. Sets the remote transaction ID when using CICS MRO.
`tibss-service-id` | V | $$SYSTEM | Puts the service ID of the trigger or recipe on the outgoing message as a property, `tibss-service-id`.
`tibss-ss-id` | V | $$SYSTEM | Puts the Substation ES ID on the outgoing message as a property, `tibss-ss-id`.
`tibss-userid` | E | $$SYSTEM | Sets the user ID of the CICS transaction.

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