Yes,I have amended invoice today morning.
I explain to you about this things of shanghai customs understanding now:
1.Shanghai customs think DDP cargo declare value is FOB value +air freight+Inssurance,but they just see your entry issue FOB value
2.Shanghai customs think this cargo air freight is about USD1106 amount,this air freight is also need charge Duty & vat.
3.China customs charge duty & vat is base on CIF value.
So I suggest that such as this cargo will need invoice issue FOB in the future.If you are insist of DDP in invoice,it will still hanppen delay by customs.