Hi @EdgarIvanV: I don't see a reason for this behavior. Were you able to trace and find where the values are removed?

Thanks

@EdgarIvanV  Try by adding the action set  on change Post Value/Refresh the section and see if then the value is been hold on the next screen or is it still lost.

@EdgarIvanV  could you try the same approach used on the Community Edition available by Pega on My Trials. I have just created a two stage case type and a data type to source the Multi-select list component and it work well. I have created a Page List property(Work-MyCaseType) with the same class as the datatype and the selected options were persisted.