Managing Unmapped Columns Follow the steps below to show and correct unmapped columns. View and correct unmapped columns On the DWD Designer, click DWD Solution > Maintenance Tasks. Click Show and Correct Unmapped Columns in the Maintenance Tasks screen. Select a system to analyze. If there are unmapped columns, objects that have no source definitions are displayed in a tree view. Double-click on a column to set the definition. Double-click an object to open the AutoRemap window.