User made transformation wont output new variables

[Ullsokk]

I have made a user made transformation that loops throug five variables, and generate five new columns (with shorthand versions of the original columns). Is there a way to automatically get these columns in the output table without manually specifying the additional columns via the mappings pane? I do get the columns if I add a column with the corresponding name. But can this be automatically mapped to the output table?

[BrunoMueller]

Right Click on the green output box of your transformation and use the Update Metadata menu item, this should add your additional columns