handle temporary table in form extension

Hi all,

I like to insert a new datasource (for example tempTable) on an existing form. So I create a FormExtension to declare the new DataSource. This datasource should be a temporary table. Until D365FO I have to set this table to a temporary one in init-method of Datasource like tempTable.setTmp() (if table is not set to tempDB in setup). In D365FO I set the datasource to tempTable.setTmp() in datasource-eventhandler onInitialized() and tempTable.setTempData(data) in my form-extension-class... it does'nt work, there are no records shown in the form... What's going wrong?