In order to reduce the XPRA runtime during an upgrade if large amounts of data have to be handled, we recommend that you convert the majority of the data by means of a prestep report before the upgrade. Together with the upgrade tools, this report is imported into the system during upgrade preparation (source release) and should be started as a background job before the upgrade. Converting data in prestep mode is supported as of Release 3.0 since the BAS tables were delivered as early as Release 3.0. So that the data records converted in prestep mode can be identified, they are marked with the flag for the data transfer status ( DUEFL = 'X'). The remaining data is converted during upgrade by a BAS XPRA and then also marked with this indicator.