What surprises me is the recent dates on this issue which has been around for as long as multicurrency has in Quickbooks Desktop. The reference to "engineers working on this" from QUickbooks is disingenuous to be kind. I raised this issue about ten years ago and it continues to be ignored. It is either too difficult to fix or is just not a priority. I wish I knew which.
Anyway, here is a workaround.
1 Create a new PO for the foreign vendor
2 Before entering items, copy the exchange rate in the box on the bottom left and then change it to 1
3 Now all item prices will be transferred at their foreign values
4 Before saving the PO paste the current exchange rate in the box and the correct C$ values will be recorded.
I also occurs to me that C$ values are not necessary on a PO so you actually don't need to change the rate before saving.
Not ideal but it solves the problem
