Hello there, @michelleopm.
I appreciate you for sharing the steps that you've taken to get this issue sorted out. Allow me to provide additional insights about adjusting amounts for suppliers in QuickBooks Online.
At this time, being able to adjust the exchange rate of the suppliers' payment isn't available. The best way to handle the adjustment is to create a journal entry.
Know that our developers are always finding and considering new ways to improve the product. This way, we'll be able to make the product work the way you'r business needs.
For now, I encourage you to visit our QuickBooks Online Blog site regularly, to stay in the loop about our recent updates and developments.
You can always scan through these resources attached if you have questions about currency adjustments and managing exchange rates in QBO:
Let me know if you have any other questions, I'll be around to help. Take care!
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