Reading internally stored strings

Hello,

I am developing a business add-in ( BADI ) for SAP BPC. SAP BPC uses infocubes and infoobjects as storage for their data. When one creates a property with a length greater then 60, the text is not stored anymore in the masterdata table of the infoobject , but as an 'internally stored string'.

Which class can be used to read 'internally stored strings' ? In the table we have an id which should point to this string.