Thank you for your comment.
We are glad to confirm customer request clearly.
They requested ETA basis, 1st FCL ETA end of March, and 2nd is ETA end of April.
So our revised PO indicate,
1st FCL: ETA Naha at end of March 2014
2nd FCL: ETA Naha at end of April 2014
We hope you would note above and give us your acknowledgement.