Hi,
Can you also tell us if you use multiple vendors on orders? If so, totals will change in those areas depending on which vendor's record is highlighted on the Totals tab in the Vendors on this Document grid.
If this is something else, are you able to provide more specific detail about when this does occur? And, as Andrew asks, also provide the version and release date (6 chars in parentheses to right of version code) of PO you are using?
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Regards,
Softrak Tech Support