Different exchange rate on line level in Financial document

JDE Edwards 9.2 - Financial Accounting

Hi,

I am noticing the following situation in a journal entry and I can't figure out what's happening:

It concerns a financial transaction as a result of a PO receipt (we use 07 standard cost) . Purchasing currency is CNY while base currency is HKD. That results in the following journal entry:

AA ledger:

Debit (stock): 2.711,26

Debit (price diff): 686,58

Credit (Inv. to be rec.) 3.397,84

CA ledger:

Debit (stock): 2.227,64

Debit (price diff): 522,31

Credit (Inv. to be rec.): 2.749,95

The exchange rate used for this transaction is based on the PO date and is 0,8216252.

However, when I calculate back the exchanges rates on line level, I get different rates for each line: