Identity Type in Field Data Window in UDF

Dear All

While going through the documentaion 'HowTo_UDFs_88' I encounter field type as 'Identity'. But in my application (SAP B1 8.82 PL 5) I could not found this type. We have only 'Alphanumeric', 'Numeric', 'Date / Time', 'Units & Totals' and 'General'. So can any one highlight why 'Identity' type is not available in my application.

Thanks & with regards

Swapan Ganguly