Dear Leandro,
As per your suggest, I checked the original purchasing orders and the currency used all are local currency USD, Please see below shotscreen from system.
The first 2 line items generate within FI module can be posted via FBV0 batch input
Transaction currency: USD
Local Currency: USD
Exchange Rate: Blank
The other line items generated in MM module via T-code MIR7 could not be posted via FBV0 batch input.
Transaction currency: USD
Local Currency: USD
Exchange Rate: 1
I don't think the exchange rate place will have some impact on the posting, but really can not find any other discrepancy to make the error.
Thanks and regards,
Annika