On my trip to the USA we had 4 lunches where the tip was not initially taken into account and I could therefore see the USD amount and the EUR amount debited and check a correct $ exchange rate.
Today, when I check my account I see these 4 amounts in EUR changed, probably including the tip that I approved on the check. However the USD amount still remains as initially debited, hence the exchange rate 1/ is totally screwed-up and 2/ does not reflect the rate as dispalyed on the transaction details.
This way of doing does not allow a correct audit of these 4 transactions. You should either change the USD amount as well (which is the total amount I have approved on the original check including tip) or, preferably even, add one specific line for the tip only with USD and EUR and exchange rate applied just below the initial billing.
For example in my account.
Initial txn dated 06/10/2017 – 7 Old Fulton – $149.16, €127.21, xrate 1.1725
Chgd txn dated 06/10/2017 – 7 Old Fulton – $149.16, €148.40, xrate 1.1725
Please explain and correct.