Singapore InvoiceNow Pre-flight Validation
IMDA / SG PINT conformance rule pack that blocks bad invoices before they leave your Access Point
A pre-flight conformance gate for Singapore's nationwide InvoiceNow network (operated by IMDA on the Peppol framework). It re-implements the checkable subset of the SG PINT Schematron locally and refuses to dispatch a non-conformant document, so a rejection is caught before the invoice leaves your Peppol Access Point — not asynchronously, after the move is posted and a message id is spent. Built on Singapore InvoiceNow and the shared e-Invoice Core Engine. Compatible with Odoo 18 & 19.
Catch the reject before you send
On the InvoiceNow network the Access Point and the recipient corner run the SG PINT Schematron over your UBL. A single out-of-list code or a GST arithmetic slip means an asynchronous rejection you have to reconcile. This module runs those rules locally and tells you the exact failing rule identifier so you can fix the invoice and resend cleanly.
Code-list conformance
Tax category, invoice / credit-note type code, unit of measure (UN/ECE), payment means (UNCL4461), endpoint scheme and currency are each checked against the closed SG PINT code lists. An out-of-list value is a hard reject on the network — this stops it at the door.
GST arithmetic
A standard-rated category must carry a positive rate; zero-rated,
exempt, out-of-scope and reverse-charge categories must carry exactly
0%. Each category subtotal's tax amount must equal
taxable × percent / 100 within
rounding tolerance.
Structural PINT rules
Exactly one tax subtotal per category and rate, every line category represented in the GST breakdown (BR-CO-18), unique non-empty line identifiers (BT-126), the SGD tax-accounting currency on foreign-currency invoices (BT-6), and the credit-note billing reference.
Identifier conformance
Supplier and customer UEN structure with the ACRA weighted check-letter,
the IRAS GST registration-number format, and the Peppol participant
scheme (0195, SG:UEN) — enforced on the document before
dispatch.
Peppol receiver lookup
Derives the receiver's SMP DNS name via the real Peppol SML
B-<md5> hash algorithm and, when you enable it,
confirms over the public discovery endpoints that the receiver is
actually registered for SG PINT before you send. No invoice content
is ever transmitted by this module.
Off / Warn / Block
A company setting chooses the enforcement mode. In Block mode the sender's Send via InvoiceNow action is refused when the document carries any conformance error, with the exact failing rule codes. In Warn mode the issues are shown but dispatch is allowed.
How it fits
This module adds no transport of its own — it hardens the dispatch path you already have. A Pre-flight Check button and a standalone wizard run the rule pack on demand and store a structured report (error / warning counts plus the full text) right on the invoice, so a user can fix the document and re-run in seconds.
Bring your own keys
No transmission and no bundled credentials. The optional Peppol receiver lookup uses only the public SML / SMP discovery endpoints. Everything runs on your own database.
Screenshots
Invoice Imda Pre Flight Conf
Update date: 2026-07-02