Can you set fields as requied at the row level in a table?

I have a table that is used to add data (rows). Can certain fields be set to required base on other values in that row?

It is not clear from the developers guide exactly how to accomplish this. When I follow the example given all rows are still impacted by a change. This is probably because the PVO has only one record in it and not a record for each row. Is that correct?

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