In SailPoint IdentityIQ, certain objects are designed to be extended by updating their corresponding Hibernate Mapping (.HBM) files. However, the WorkItem object is not one of these extendable objects. The WorkItem is a system object that primarily represents tasks or actions that need to be processed within the workflow. It is not intended to store client-specific data through direct modification of its .HBM file. Instead, client-specific data should be handled using other mechanisms, such as custom attributes or the extension of Identity or Account objects. Attempting to modify the WorkItem object's HBM file could lead to unexpected behavior and is not supported by SailPoint's best practices.
Reference:
SailPoint IdentityIQ Customization Guide
SailPoint IdentityIQ Object Model Documentation