This is not a complaint. Please note below information on changed regulations in Thailand. Can you investigate below and send us some feedback.
Seems like they want shipping line booking number 20 days before agreed shipment week.
Please give us your comments on how to solve below.
Please also discuss with shipper so we find good set up for all parties.
We would like to be informed with PO numbers on all bookings ASAP so we can inform consignee.