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Rule Engine equivalant to add (one) additional row instead of column?

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My current issue is that I want to add as a row, instead of a column. I only have a single row with two columns, the new row has identical contents.This is for running in a loop.

I currently solved this by giving the single row in my loop a new RowID each iteration, then I use concatenate with the single (repeating row). This gives for each iteration a warning message from the RowID.

See picture, in case my blabbering isn't that clear.

I have used in other cases Rule-Engine to succesfully add a new column upon a certain condition, so I wonder if this or similar could be use for Row?

I imagine my problem is easier to solve in java or python, but since I don't know them very well....


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