MyInvois production data validation: From 15 August 2026, HASiL will enforce enhanced field checks in the MyInvois Production environment. Businesses using API integrations or Batch Upload should correct invalid dates, unsupported codes and excessive field lengths before submission, because non-compliant e-Invoices may fail to process.
The rules were tested in the Sandbox environment from 15 December 2025. Finance teams, ERP owners and e-Invoice vendors should now confirm that their Production mappings follow the latest MyInvois Software Development Kit (SDK).
In this article: What changes · Fields to check · Common errors · Preparation checklist · Rejected submissions
What changes on 15 August 2026?
In its MyInvois SDK 1.0 Release, HASiL confirmed that enhanced field validation will be deployed to the Production environment on 15 August 2026. The purpose is to improve data integrity and standardise information submitted through MyInvois.
This is a Production enforcement date, not a new e-Invoice implementation phase. A business that is already required to issue e-Invoices should review its existing system and data before the validation takes effect.
MyInvois fields businesses should check
| Field | HASiL validation requirement |
|---|---|
| Date fields | Use a valid date in YYYY-MM-DD format. Entries such as “N/A” are not permitted. |
| Supplier’s bank account number | Maximum 150 characters. |
| e-Invoice code or number | Maximum 50 characters. |
| Certified Exporter authorisation number | Maximum 300 characters. |
| Incoterms | Maximum 3 characters. |
| Frequency of billing | Maximum 50 characters. |
| Unit of measurement | Use a unit code listed in the MyInvois SDK. |
| Supplier’s business activity description | Maximum 300 characters. |
| Payment terms | Maximum 300 characters. |
| Prepayment reference number | Maximum 150 characters. |
The same SDK release also asks taxpayers to follow the prescribed codes and limits for state, shipping postcode, country, payment mode, tax type and currency. For example, a Malaysian shipping postcode must not exceed five characters, while a non-Malaysian postcode may contain up to 50 characters.
Common causes of MyInvois validation errors
- A date field contains “N/A”, text or a format other than YYYY-MM-DD.
- An ERP sends a description or reference number that exceeds the permitted character limit.
- A payment mode, tax type, country, currency or unit of measurement is sent as free text instead of an accepted code.
- A Malaysian shipping postcode contains more than five characters.
- An amount is transmitted in scientific notation rather than standard numeric format.
- The system mapping sends the correct value to the wrong MyInvois field.
- A Batch Upload user submits an outdated template or unsupported document version.
MyInvois production data validation checklist
- Review the latest SDK. Give the current field rules and code lists to your software vendor or internal IT team.
- Map every affected field. Compare the accounting or ERP field with the corresponding MyInvois field and data type.
- Clean master data. Correct invalid dates, postcodes, codes and descriptions before they enter an e-Invoice payload.
- Add system controls. Use field-length limits, drop-down code lists and date-format checks at the source.
- Test representative transactions. Include domestic, foreign-currency, exempt, self-billed and credit-note scenarios that apply to the business.
- Keep an error log. Record the rejected field, error message, root cause and corrective action so the same issue does not recur.
What should you do if an e-Invoice is rejected?
Read the MyInvois validation response and identify the exact field that failed. Correct the source data or system mapping, then submit a controlled test. Avoid replacing a valid business value with a placeholder merely to pass validation, because that can create inaccurate records and repeat errors later.
For example, if a payment mode is rejected, compare the value sent by the ERP with the official MyInvois payment-mode code list. Correct the mapping in the system instead of manually changing each invoice.
Is this the same as TIN and BRN validation?
No. HASiL’s TIN and BRN validation update starts on 1 August 2026 and relates to the Validate Taxpayer’s TIN API. The Production field validation described here starts on 15 August 2026 and checks the format, code or length of specified e-Invoice data fields.
Who should prepare for the change?
Finance and tax teams should confirm the business rules, while IT teams and system vendors should update field mappings and validation controls. Businesses using Batch Upload should also download the latest supported template and test it before high-volume submission.
HTL & Co can assist with e-Invoice readiness reviews, process controls and implementation support. Learn more about HTL’s e-Invoicing solutions or review the Malaysia e-Invoice implementation timeline.
HASiL Production enforcement date: 15 August 2026
HTL last updated: 30 July 2026
Official references: HASiL MyInvois SDK 1.0 Release
HASiL e-Invoice Guidelines
