Hi Gail,
In the company profile of OE, on the "systems options" tab there's an option called "Remember Form Settings" (at the very bottom). Turn this option on. Then, the next time you print an invoice, select "Location / Picking Sequence" from the drop down box beside the heading "Sort Lines".
You'll only have to do this once, and then it will default to the correct sort order.
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Ryan Brohman
Kitchener, ON