Orchestration - Updating sales order price

I found a document from oracle that goes over setting up an orchestration to update the price:

https://support.oracle.com/epmos/faces/DocumentDisplay?_afrLoop=311208007358868&id=2606552.1&_afrWindowMode=0&_adf.ctrl-state=55qn3hv3n_53

Does anyone know how to get this to allow input of more than one lines at a time? We want to make an API so that we can update multiple lines at once if needed, but so far haven't found a way to make it loop to do this. I added an array to the selection and pass it the row number and price, but it will update the last price in the array to all the lines passed to it.