Value of Object type attribute is not coming in Mail body.

Hi,

I am facing an unusual problem in my custom workflow forPMS Notification. In the Send Mail activity body, i am using attributes of my objects. Now when i tested it, the mail shows &APPRAISALDOCUMENT.STARTDATEOFDSP& instead of the value. Whereas the values of the other attributes of the same object are shown in the mail.

I checked the container of the workflow as well as the standard task, the values of all the attributes in the object are populated properly. I also checked the binding for standard task, it is proper. Can anybody tell me what could be the possible problem?