I have checked with our logistic agency, and got their idea again.
According to their experience, when they import the goods from abroad to China like our case,
Oversea Producer(Exporter) → Oversea Trading Company → Chinese User(Importer)
they will get 2 sets of documents from Oversea Trading Company and submit them to Chinese customs.
※The applicant of their Form-E is the Oversea Producer.
1. Oversea Producer’s INV,PL, and Form-E ⇒ to prove the goods come from the Oversea Producer’s country
※the price of INV is usually concealed
2. Oversea Trading Company’s INV, PL, BL ⇒ for the use of import procedure, and payment.
Could you check with your logistic agency if you can use same method for your customs clearance?