Add Multiple Row of a UI Designer Form to Process Variables


I need to create a page in the UI Designer that is a sort of place to select the products that will be added to an order, I saw the example of Expense Reports, where all created lines are added in an array, but how I am bringing data from the External data (PostgreSQL) to display to the user, I need to assign the value of the selected row to a UI Designer transient variable, so I can see the sales price according to the selected product. Well, when I add the second line as if you have two different products in the same order, the content is already filled with the same data that was selected in the first row, and if I change the second row the first one changes too, Any way I can add new lines and that they come in blank so the user can select the record he wants?

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