Hello @SA_CapG To create a data type in Pega that is stored in BLOB you should create a data class as always in Dev Studio, e.g, in PegaDATA table, set it to a concrete class (to be able to create instances / save to it). You add an existing data type and mark properties as relevant records so they are visible. You should not specify source/records as adding it would expose the properties to the table, and we want to avoid that. You just need to create custom data pages / savable data page. Once you add some data by using a savable data page, a class instance will appear. You can view XML or the clipboard to verify the data inside.