Exchange rate management in F-28

Hi Experts,

I have done the following transactions.

System: ECC6 & New GL is active

Local currency is EUR

   1. created customer invoice (F-22)

invoice amount is 1000USD (foreign currency)

Exchange rate - 1.5

Local amount is 1000$ * 1.5=1.500,00EUR

2. created another customer invoice (F-22)

invoice amount is 1000USD (foreign currency)

Exchange rate – 0.8

Local amount is 1000$ * 0.8=800,00EUR

3. Created incoming payment (F-28)

amount is 2.000,00USD

Exchange rate - 2

Local amount is 2.000,00 * 2 = 4.000,00EUR

When I simulated this payment
there is an exchange gain/loss item.

In this document, system calculates totalexchange gain/loss and created respective
item.

Amount in USD 0,00

Local amount 1.700,00 (1.500,00EUR+800,00EUR - 4.000,00EUR)

Question: I need that the system create two different line item
for gain/loss one for each open item

1.a for first customer invoice (F-22)

invoice amount is 1000USD (foreign currency) and 1.500,00EUR
(local amount)

Exchange rate of collection - 2

Local amount for collection is 1000$ * 2=2000EUR

GAIN 2000-1500= 500

  1.a for second customer invoice (F-22)

invoice amount is 1000USD (foreign currency) and 800,00EUR
(local amount)

Exchange rate of collection - 2

Local amount for collection is 1000$ * 2=2000EUR

LOSS 2000-800= 1200

Thanks,

Flavia