Help needed in this query - Plzz someone help me

[nrmarthi]

SELECT (Max(ReferenceDescription.ReferenceID))
FROM (ReferenceDescription)
WHERE (ReferenceDescription.ReferenceID >= (ReferenceDescription.CategoryID * ReferenceDescription.DepartmentID) AND ReferenceDescription.ReferenceID <= (INT(ReferenceDescription.CategoryID * ReferenceDescription.DepartmentID * 0.9999))