I have managed to find 3 transactions that caused issues above in my original business.
Just by deleting foreign currency value at the end solves the issue
I have also been able to replicate the issue using new business file.
Step 1. Main Currency - EUR
Step 2. Created supplier in USD
Step 3. Created invoice with 59.99 USD item
Step 4. Paid that invoice with 50.84 EUR
Step 5. forex for any date later than this transaction is broken
Step 6. If 59.99 is changed to 60.00 - problem goes away
Other two transactions are: 85.49 GBP to 99.53 EUR and 1597.88 HRK to 216.79 EUR
I haven’t tested those two in dummy business but assume they will cause same issues
Not sure why only those specific number pairs are causing those issues
I am attaching dummy manager backup file as reference
test (2019-04-15).manager (36 KB)