Release Notes – CSV Upload Feature for Link4 Invoice Express (Singapore)

Overview

As part of Link4’s continued investment in enhancing the Singapore InvoiceNow platform, we are pleased to introduce a new CSV Upload feature within the existing Link4 Invoice Express system.

Link4 Invoice Express is a mature, production-ready InvoiceNow-Ready Solution Provider (IRSP) platform serving more than 10,000 businesses across multiple markets. This release adds a powerful bulk upload capability to the Singapore IRSP dashboard, enabling users to import invoice and purchase transactions directly from a CSV template.

This enhancement is designed to simplify onboarding, reduce manual data entry, and support compliance with Singapore’s GST InvoiceNow Requirement.

What's New in This Release

A new menu option, CSV Upload, has been added to the Link4 Invoice Express dashboard.

Users can now:

• Upload transactions in bulk using a CSV file
• Select the transaction document type
• Submit files for automated validation and processing
• Track processing status in real time
• Review upload history and file details
  

Supported Document Types

The CSV Upload feature currently supports the following document types:

• Invoice
• Credit Notes
• PCP Invoices
• Non-Peppol Purchases
  

Recommended Limit: For best performance, Link4 recommends uploading a maximum of 200 rows per CSV file. Larger files may still be accepted depending on system capacity, but processing times may increase.

Processing Status Monitoring

Each uploaded file displays a processing status such as:

• File Processed
• Processing
• Failed Validation
  

Upload History

Users can review historical uploads, including:

• Document Type
• Sender
• Receiver
• Status
• File Name
• Upload Date
  

How to Use

1. Log in to Link4 Invoice Express.
2. Navigate to CSV Upload.
3. Select the relevant Document Type.
4. Click Choose File.
5. Select the completed CSV template.
6. Click Submit Document.
7. Monitor the upload status in the Interim Uploads section.

CSV Template Field Definitions

1. Invoice Identification

Field Name	Description	Example	Mandatory
req_id	Unique request ID used to group rows into a single invoice. Use the same value for all line items belonging to one invoice.	L4-44	Yes
e_inv_code	Invoice or credit note number. Must be unique per supplier.	INV-1001	Yes
e_inv_dt	Invoice issue date.	2026-02-01	Yes
e_inv_due_date	Payment due date.	2026-04-30	No

2. Supplier Information

Field Name	Description	Example	Mandatory
supplier_name	Legal name of the supplier.	LINK4 PTE. LTD.	Yes
supplier_tin	Supplier UEN or tax identification number.	201928579D	Yes
supplier_add	Supplier address.	Central Region, Singapore	Yes
supplier_add_postal	Supplier postal code.	737715	No
supplier_country_code	ISO 3166-1 alpha-3 country code.	SGP	Yes
suppler_bank_ac_no	Supplier bank account number.	123456789	No

3. Buyer Information

Field Name	Description	Example	Mandatory
buyer_name	Customer legal name.	Nirvasoft	Yes
buyer_tin	Customer UEN or tax identification number.	199900940W	Yes
buyer_email	Customer email address.	customer@example.com	No
buyer_add	Buyer full address.	1 Raffles Place	No
buyer_add_street	Street line 1.	1 Raffles Place	No
buyer_add_street2	Street line 2.	#10-01	No
buyer_add_city	City name.	Singapore	No
buyer_add_state	State or province.	Singapore	No
buyer_add_postal	Postal code.	048616	No
buyer_country_code	ISO 3166-1 alpha-3 country code.	SGP	No

4. Invoice Header Information

Field Name	Description	Example	Mandatory
inv_curr_code	Currency code (ISO 4217).	SGD	Yes
class	Invoice classification code used for IRAS categorisation.	4	Yes
pay_mode	Payment mode.	Bank Transfer	No
pay_terms	Payment terms.	30 Days	No
bill_ref_no	Billing reference or customer reference.	PO-10001	No
entity	Business entity or division name.	Singapore HQ	No

5. Line Item Information

Field Name	Description	Example	Mandatory
desc_of_service	Description of goods or services.	Sale of Digital Content	Yes
quantity	Quantity billed.	1	Yes
measurement	Unit of measure code (e.g., XNA = each).	XNA	Yes
unit_price	Unit price excluding tax.	50.76	Yes

6. Tax Information

Field Name	Description	Example	Mandatory
tax_type	Internal tax type code.	1	Yes
tax_rate	GST rate percentage.	9	Yes
tax_amt	Tax amount for the line.	4.57	Yes
total_taxable_amt	Total taxable amount.	50.76	Yes

7. Totals

Field Name	Description	Example	Mandatory
sub_total	Line total including tax.	54.82	Yes
total_exl_tax	Total excluding tax.	50.76	Yes
total_inc_tax	Total including tax.	54.82	Yes
total_net_amt	Net amount after discounts and before tax.	50.76	Yes
total_pay_amt	Final payable amount.	54.82	Yes
rounding_amt	Rounding adjustment.	0.01	No

8. Discounts and Charges

Field Name	Description	Example	Mandatory
discount_rate	Discount percentage.	10	No
discount_amt	Discount amount.	5.00	No
fee_rate	Additional charge description or rate.	Handling Fee	No
fee_amt	Additional charge amount.	2.00	No

9. Prepayment Information

Field Name	Description	Example	Mandatory
pre_pay_amt	Prepayment amount.	100.00	No
pre_pay_date	Prepayment date.	2026-01-15	No
pre_pay_ref_no	Prepayment reference number.	DEP-001	No

Important Rules

req_id Grouping Rule

• Each invoice must have a unique req_id.
• Multiple rows with the same req_id are combined into one invoice.
• Header fields must be identical across all rows with the same req_id.

Recommended File Size

• Recommended maximum upload size: 200 rows per CSV file.

Date Format

• Use YYYY-MM-DD.

Currency Codes

• Use ISO 4217 codes such as SGD, USD, AUD.

Country Codes

• Use ISO 3166-1 alpha-3 codes such as SGP, AUS, MYS.
  

Example Multi-Line Invoice

req_id	e_inv_code	desc_of_service	quantity	unit_price
INV001	S-1001	Product A	1	100.00
INV001	S-1001	Product B	2	50.00
INV001	S-1001	Product C	1	75.00

Summary

The new CSV Upload feature is a significant enhancement to the existing Link4 Invoice Express platform, enabling users to upload invoice and purchase data in bulk using a standard CSV template.

Built on a trusted platform serving more than 10,000 users, this release provides a practical and scalable way for Singapore businesses to streamline transaction processing and comply with the GST InvoiceNow Requirement.

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