"Reason for Status" in Service Ticket

Hi Experts,

In IC Webclinet (SAP CRM 2007) I am in the porcess of configuring a Transaction Type for Service Ticket. There is field called "REASON FOR STATUS" which needs to be filled in every time when the status of the Service Ticket is changed. I am not able to find this in the system. Can any one suggest how do I configure this field in the system.

Regards,

Ronit