Hi Sudesh,
so, the behavior you described sounds logical to me. As I assume NE is categorized as "2 Sales Packaging/Not packed" and mapped to a sales unit in IMG "SPRO > Global Trade Services > Customs Management > Customs Code Lists > Derive Package Type from Sales Unit" GTS takes the sales quantity from the order/delivery and map it to the custom code NE (as you have set it up in the customizing). We often have this case and due to customs regulations that´s correct.
If you expect 0 number of packages, will you then manually maintain the package data in the GTS customs declaration? Or how else should GTS get the needed information?
I guess from TM you cannot get the needed information. GTS can to my knowledge only fetch packaging data while the customs document is created from the linked delivery.
Come back if you more questions.
Tobias