Dear Nattaphong san
The reason is due to the HS code for Multemp AC-D have been changed to 34039990 recently due to our custom requirement.
Hence, 27101944 is no longer valid for declaration any further.
Would you explain to us what is reason why does the custom could not accept the Form D with new HS code?
Is there any way your side could propose to custom to accept this new HS Code for this shipment and onwards?