Hi Andew,
Did you ever find out an answer to this? Same situation; items entered using wrong price list. Changed price list which has no affect on already entered items. Saved order, then tried copying it to a new order with "Update item information and pricing" checked. Nothing changed although help says: 'Turn this checkbox on if you want OrderEntry to check the item information and current prices against the original order, and update that information.' It appears that it's only comparing copied price code field to original price code field, not the prices to the price code field. Any other workarounds - not looking forward having to re-type everything.
Thanks
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Mike Smith
Viktorian Sheet Metal Mfg Inc