Hi Scott,
Jennifer's suggestion is best to work with but I also found a way that could work in same script.
I am not sure, if that may work in the specific template you are using, but mine worked with for example VK12 changing some price conditions.
What i did was i duplicated the exact column from the expert view, and mapped one as download in a column and another as upload in another column.
I kept the download column ahead of the upload column, so while running i managed to get the old values, and upload new one.
I have not tested this with Loop, and yes doing so made my script run a bit slower. So that maybe the price one would have to pay. Also might not work in your specific t-code.
BR,
Manoj
------------------------------
Manoj Adhikari | Pricing Analyst
Metso Oy | +358440526010
------------------------------