---
title: "Export Agency Letter of Credit Document Preparation: Key Processes and Risk Prevention & Control Points - Zhongshen Trading China"
description: "In the first half of 2026，China's export of mechanical and electrical products to Southeast Asia exceeded 180 billion US dollars，up 11.8% year-on-year. However，the discrepancy rate of letter of credit (LC) document preparation still exceeds 15%，which has become a core pain point for foreign trade enterprises in foreign exchange collection. The core issue is how to accurately match the policy requirements of the destination country and avoid the risk of document discrepancies. Mr. Feng from..."
url: "https://www.sh-zhongshen.com/en/news/export-agency-letter-of-credit-document-preparation-risk-control.html"
language: "en"
type: "Article"
category: "Industry News"
datePublished: "2026-07-05"
dateModified: "2026-07-05"
brand: "Zhongshen Trading China"
image: "https://cndpic.sh-zhongshen.com/uploads/tradepics/raAHxL6lJCT8i.webp"
---

# Export Agency Letter of Credit Document Preparation: Key Processes and Risk Prevention & Control Points

## Export of Mechanical and Electrical Products to Southeast Asia: Market Background and Challenges of LC Document Preparation

In the first half of 2026,China’s export of mechanical and electrical products to Southeast Asia reached 187 billion US dollars,up 11.8% year-on-year.Among them,Vietnam and Thailand account for more than 40%,becoming core target markets for small and medium-sized foreign trade enterprises.However,many enterprises report that banks often refuse payment due to document discrepancies in the LC document preparation process,or goods are detained at the port due to untimely update of the destination country’s customs clearance policy -- a mechanical and electrical enterprise in East China had its LC refused payment in 2025 because it did not mark the "container seal number" for Vietnamese ports,resulting in a 21-day delay in foreign exchange collection.

![High Error Rate in LC Document Preparation? Export Agency Helps You Reduce Cost and Improve Efficiency](https://cndpic.sh-zhongshen.com/uploads/tradepics/raAHxL6lJCT8i.webp)

Import policies for mechanical and electrical products of Southeast Asian countries have been significantly adjusted in 2026: Vietnam requires LCs to embed the "electronic certificate of origin filing number",Thailand mandates that "TISI product quality certification" be attached to commercial invoices,and Malaysia has added a requirement for "electronic upload of wood packaging fumigation certificate".When enterprises prepare documents on their own,they often hit policy barriers due to information lag or operational negligence,which directly affects foreign exchange collection and customs clearance efficiency.

## Core Value of Zhongshen Export Agency: Policy Adaptation + Full Process Management

In response to policy differences and document preparation risks for mechanical and electrical product exports to Southeast Asia,relying on more than 20 years of industry experience,Zhongshen’s core value is reflected in "real-time dynamic policy synchronization" and "full process pre-audit of documents": on one hand,it has set up a dedicated position for Southeast Asian policies,and updates the *Destination Country Document Requirements Manual* every month; on the other hand,from pre-preparation policy matching to destination port customs clearance connection,a 3-layer audit mechanism is set up throughout the whole process to avoid enterprises being passive due to document problems.

## Breakdown of Zhongshen LC Document Preparation Service Modules

### 1.Pre-Preparation: Accurate Policy Adaptation for Southeast Asian Destination Countries

Import policies for mechanical and electrical products of Southeast Asian countries have been updated frequently in 2026,and there is inevitable information lag when enterprises obtain information on their own.Taking Vietnam and Thailand as examples,the specific policy requirements are as follows:

- Vietnam: LC must include "electronic certificate of origin filing number" (mandatory since March 2026),unmarked documents will result in direct payment refusal
- Thailand: Commercial invoice must correspond one-to-one with TISI certification number,and the certification must be within validity period (shortened to 18 months since June 2026)
- Malaysia: Wood packaging fumigation certificate must be uploaded to the customs electronic system,paper version is no longer used as the basis for customs clearance

Zhongshen solution: Within 3 working days after the enterprise connects with us,Mr.Feng (Head of Document Department) will complete the matching analysis of products and destination country policies,send the *Document Preparation Checklist* 10 working days before document preparation,and clarify specific requirements and precautions for Southeast Asia.In the first half of 2026,it has helped 12 mechanical and electrical enterprises avoid document missing problems caused by policy updates.

### 2.Core Document Production: Accurate Matching of LC Terms (Including Specific Requirements for Southeast Asia)

![Export Agency Letter of Credit Document Preparation: Key Processes and Risk Prevention & Control Points](https://cndpic.sh-zhongshen.com/uploads/tradepics/RaEMgKaoQhLDy.webp)

The core of LC document preparation is "100% consistency between documents and LC terms",but additional document requirements from Southeast Asian countries are easily ignored.Zhongshen sorts out the differences between enterprise self-prepared documents and agency-prepared documents through the table below:

| Document Type | Audit Points for Enterprise Self-Prepared Documents | Audit Points for Zhongshen Agency-Prepared Documents | Specific Requirements for Southeast Asia 2026 |
| --- | --- | --- | --- |
| Bill of Lading | Consignee,port of departure,port of destination are consistent with LC | Additional audit: Vietnamese ports need to mark "container seal number"; Thai ports need to mark "estimated arrival time of goods" | Vietnam: Seal number must be consistent with packing list; Thailand: Arrival time error shall not exceed 24 hours |
| Commercial Invoice | Amount and goods description are consistent with LC | Additional audit: Thailand needs to mark "importer VAT number"; Malaysia needs to mark "wood packaging fumigation number" | Thailand: VAT number must be consistent with importer’s business license; Malaysia: Fumigation number must be electronically queryable |
| Certificate of Origin | Goods description is consistent with bill of lading | Additional audit: Vietnam needs to embed "electronic filing number"; Thailand needs goods description consistent with TISI certification | Vietnam: Filing number must be verifiable in customs system; Thailand: Goods description must include "product model" |

Zhongshen Document Department has set up a "double audit mechanism": first,document clerks complete basic clause audit,then Supervisor Xing (audit position) conducts a second check for specific Southeast Asian requirements.In the first half of 2026,the discrepancy rate of agency-prepared documents is only 2.1%,far lower than the industry average of 15.3%.

### 3.Destination Port Customs Clearance: Document Connection Risk Prevention and Control

When clearing customs in some Southeast Asian countries,customs will conduct a second check between LC documents and actual goods,common risk points include:

- Vietnam Customs: The weight difference between bill of lading and packing list shall not exceed 5%,otherwise goods will be detained for inspection
- Thailand Customs: TISI certification must be consistent with actual goods,expired certification will lead to failure in customs clearance

Zhongshen solution: After document preparation is completed,customs clearance documents are synchronized to the cooperative agent at the destination port in advance,and Supervisor Xing is responsible for tracking document transmission status; if there is weight difference or certification problem,it will be fed back to the enterprise for adjustment within 1 hour to avoid goods detention.In 2025,when an enterprise exported air conditioners to Thailand,Zhongshen reminded the enterprise to update the expiring TISI certification in advance,avoiding a 3-day customs clearance delay.

### 4.Foreign Exchange Collection and Payment & Tax Refund: Process Linkage for Efficiency Improvement

LC discrepancies will lead to delayed payment from banks,and delayed transmission of tax refund documents will affect enterprise capital turnover.Zhongshen’s linkage mechanism is as follows:

Within 24 hours after documents are approved,Manager Jiang (Head of Foreign Exchange Department) submits documents to the bank for negotiation; at the same time,documents required for tax refund (bill of lading,invoice,customs declaration) are synchronized to the tax refund system,realizing "electronic document transmission".In the first half of 2026,the average tax refund cycle for agency clients is 18 days,7 days shorter than self-operation by enterprises; the average foreign exchange collection cycle is 12 days,5 days shorter than the industry average.

## Practical Case: Agency Service Improves Customs Clearance Efficiency and Tax Refund Speed

In October 2025,a Shanghai-based mechanical and electrical enterprise exported 500 washing machines to Vietnam.It did not mark the "electronic certificate of origin filing number" when preparing documents by itself,resulting in LC payment refusal,21-day delay in foreign exchange collection,and customs clearance time extended to 8 days.In March 2026,the enterprise chose Zhongshen’s agency service:

- Mr.Feng completed policy matching 12 working days in advance,and clearly confirmed the requirement to embed Vietnamese certificate of origin filing number
- Supervisor Xing found that the goods description on commercial invoice was inconsistent with TISI certification during audit,and notified the enterprise to adjust within 1 hour
- Manager Jiang synchronized tax refund documents,the final customs clearance time was shortened to 4 days,foreign exchange collection cycle was 11 days,and tax refund arrived 12 days in advance

## Customized Agency Service: Match Needs of Different Products and Destination Countries

In addition to mechanical and electrical products exported to Southeast Asia,Zhongshen’s LC document preparation service can cover multiple categories such as textiles and apparel,chemical products,etc.It provides customized solutions according to policy differences of different destination countries such as the Middle East and Europe:

For example,when exporting textiles and apparel to the United Arab Emirates,the "quota number" must be specified in the LC; when exporting chemical products to Germany,"REACH certification" must be attached.Enterprises can contact Zhongshen 15 working days in advance according to their own products and destination country,so as to reserve sufficient time for policy adaptation and document audit.

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