句子成分问题：Enclosed is our purchase order in duplicate.请问 in duplicate 作状语还是定语?

Enclosed is our purchase order in duplicate
.请问 in duplicate 作状语还是定语?
以上句子为一个倒装句,句子表语提前到了居首,句子语法结构分析为
主语：our purchase order（我们的采购订单）
修饰主语后置定语：in duplicate （一式二份）
系动词：is (是）
表语：enclosed( 被附上的)
in duplicate
英 [in ˈdju:plikit] 美 [ɪn ˈdjupləkɪt]
[经] 一式二份；一式两份
1.This agreement is done in duplicate.
本协议书一式两份.
2.Enclosed is our contract No.345 in duplicate,of which please return us one copy,duly countersign.
随函附上我方第345号合同一式两分,请会签并回寄一份.
3.The installations tested were of two kinds,each in duplicate.
试验中采用的装置有两种,每一种两份.
4.Type the letter in duplicate.
请把这封信打成一式两份.
5.The chemical beds are provided in duplicate.
化学吸湿剂是成对设置的.
6.Usually we ask for a draft in duplicate.
我们通常要求草图一式两份.
7.Signed Commercial Invoice in duplicate showing a deduction of USD200.00 being commission.
签字商业发票一式二份,显示扣除200美元作为佣金.
8.We are enclosing our Confirmation of Purchase in duplicate.
现随函附上我方购货确认书一式两份.
9.Please complete in duplicate and in BLOCK letters.Delete as appropriate.
请用正楷填写及呈效正副本各一.删去不适用者.
10.Please send us quickly your program invoice in duplicate.
从速寄来贵方估价单一式两份.
11.Please complete in BLOCK LETTERS and submit in DUPLICATE.
请以正楷填写,并一式两份递交.
12.This contract in duplicate,shell Yi hold each a copy of.
本合同一式二份,甲乙各执一份.
13.Tese are the original contract in duplicate we have prepared.
这是我们准备好的两份合同正本.
14.This Agreement is in duplicate,one original for each party hereto.
本协议一式二份,各方圴持有一份正本.
15.The enclosed proforma invoice NO.1002 in duplicate cover 50,000 yards Poplin.信
内附上五万码府绸第1002号形式发票一式两份.
16.Certificate of china origin in duplicate issued by chamber of commerce.由主管当局颁发的原产地证.
17.Please fill in this draft in duplicate and sign it.
请填上这份票据,一式两份,然后在上面签名.
18.We have made out invoice in duplicate.
我们已开出一式两份发票.
19.Enclosed is our program invoice in duplicate.
随函附上我方估价单一式两份.
20.We enclosed our Purchase Confirmation No.777 in duplicate.
附寄第777号订购确认书一式两份.