1. signed commercial invoice 已签署的商业发票
（in duplicate 一式两 in triplicate 一式三份 in quadruplicate 一式四份 in quintuplicate 一式五份 in sextuplicate 一式六份 in septuplicate 一式七份 in octuplicate 一式八份 in nonuplicate 一式九份 in decuplicate 一式十份）
2.beneficiary‘s original signed commercial invoices at least in 8 copies issued in the name of the buyer indicating （showing/evidencing/specifying/declaration of） the merchandise， country of origin and any other relevant information. 以买方的名义开具、注明商品名称、原产国及其他有关资料，并经签署的受益人的商业发票正本至少一式八份
3.Signed attested invoice combined with certificate of origin and value in 6 copies as reuired for imports into Nigeria. 以签署的，连同产地证明和货物价值的，输入尼日利亚的联合发票一式六份
4.beneficiary must certify on the invoice…have been sent to the accountee 受益人须在发票上证明，已将……寄交开证人
5.4% discount should be deducted from total amount of the commercial invoice 商业发票的总金额须扣除4%折扣
6.invoice must be showed： under A/P No.… date of expiry 19th Jan. 1981 发票须表明：根据第……号购买证，满期日为1981年1月19日
7.documents in combined form are not acceptable 不接受联合单据
8.combined invoice is not acceptable 不接受联合发票