Invoice date in Form D is right (May 4, 2015).
Actual departure date in Form D is right (May 6, 2015).
Flight number and actual departure date in Air Waybill is right (CX776 / May 6, 2015)
There is no mistake with detail Form D and Air Waybill from us.
You should request to Ohmori san for revise invoice date GMC-150501.