According to the discrepancy of invoice and PO, Do you means it's concerning the term of payment, right?
On the PO is FOR, but on the invoice is CFR Chicago.
If you have confused at this point, I have informed to Brent and have sent the revised proforma invoice that have been changed the term of payment from FOB to CFR Chicago to him via the e-mail on 7th Feb, 2014.
Could you please kindly check the detail with him again.