Transitioning to S/4HANA

Transitioning to S/4HANA

What is changing? 

INPEX is moving from SAP ECC to SAP S/4HANA, with go-live planned for 1 November 2026. This change will simplify, standardise and improve the way we work.​

It will also affect how supplier-related transactions are managed, including purchase orders (POs), goods receipts, service entry sheets, invoices, contracts and supplier master data.​

Please email [email protected] for more information.​

  • What to expect during the transition

    Our transition period refers to when data is transferred from our old Enterprise Resource Planning (ERP) system "SAP ECC" to our new ERP system SAP S/4HANA.​

    Ahead of the transition, INPEX will progressively slow down and stop transactions for some business activities to allow data to be extracted, validated and transferred into the new SAP S/4HANA. This will include master data from late September 2026 and transactional activities progressively from 12 October 2026 until Go-Live. ​

    The transition period for suppliers is planned to begin mid-October, with a full ‘blackout’ period between the 25 October and 31 October 2026. For more information, please see ‘Key dates for suppliers’.​

    During the blackout period:​

    • No system transactions will be allowed​
    • Emergency activity will be managed through INPEX Business Continuity Plan processes​
    • Manual records will be used to capture any urgent business transactions, which will then be entered into SAP S/4HANA after go-live (1 November).​
  • What suppliers need to do

    To help ensure a smooth transition, suppliers are asked to take the following actions.​

    • Review open POs​

    Please review your open POs and complete any outstanding actions ahead of the transition period.​

    • Submit your invoices before the relevant cut-off dates​

    Where goods or services have already been delivered and are ready to invoice, please submit valid invoices before the relevant last date for invoice submission. This will help INPEX process as much activity as possible before the freeze and reduce the volume of transactions requiring migration or manual follow-up.​

    Invoices submitted after the cut-off may need to be held, managed through a controlled process, or processed after SAP S/4HANA Go-Live.​

    • Look out for new PO numbers after go-live​

    With the transition to SAP S/4HANA, some open POs will require new PO numbers. You must use the new SAP S/4HANA PO number on all future invoices and correspondence once advised by INPEX.​

    • If you receive a new or updated PO, please:
      ​
      • Update your internal systems and records​
      • Use the new PO number on future invoices​
      • Check that PO details align with your records​
      • Do not continue using old PO numbers unless INPEX specifically instructs you to do so​
      • Contact INPEX promptly if details appear incorrect.​

    Using an old or incorrect PO number after go-live may delay invoice processing.​

    • Avoid duplicate invoices​

    During the transition, some references may change and some transactions may be temporarily held. Please do not resubmit invoices unless INPEX asks you to do so.​

    Duplicate invoice submissions can create processing delays, reconciliation issues and payment delays.​

    • ​Respond promptly to INPEX data requests​

    INPEX may contact you to validate or clarify supplier-related data before migration. This may include open PO details, contract information, invoice status, banking or contact details, service records, or material-related information. Data cleansing and validation are key readiness activities for the S/4HANA transition.​

    Prompt responses will help reduce the risk of incorrect or incomplete data being migrated.​

  • What is not changing

    In the lead up to the transition​

    Our processes and the way you transact with INPEX will continue as usual until the transition period. The key changes that our suppliers need to be aware of pre-transition are the progressive freeze/cutoff dates for activities. You can find further details outlined in the calendar view below.​

    In the S/4HANA System​

    Unless INPEX advises otherwise:​

    • Existing contractual obligations remain unchanged​
    • Commercial terms remain unchanged​
    • Supplier contacts remain unchanged​
    • Suppliers should continue to meet delivery and service obligations​

    The transition to SAP S/4HANA changes the system and some transaction references; it does not change the underlying goods or services you are contracted to provide.​

  • Key dates for suppliers
    • 12 Oct - Freeze for Ariba material invoices and Ariba service entry sheet submissions​
    • 15 Oct - Freeze for Service Entry Sheet approvals
    • 16 Oct - Freeze for supplier invoice submission
    • 20 Oct - Freeze for creating new purchase orders​
    • 22 Oct - Freeze for supplier-initiated PO changes, freeze for invoice processing​
    • 23 Oct - Final scheduled payment run before cutover
    • 25 Oct - Transactional freeze / blackout commences
    • 1 Nov - SAP S/4HANA Go-Live!​
  • S/4HANA supplier FAQ

    Click here to view the S/4HANA supplier FAQ.

INPEX is committed to recognising and respecting Aboriginal and Torres Strait Islander peoples whose cultures have existed in Australia for more than 65,000 years.

In particular, we acknowledge the Larrakia people as the recognised Traditional Owners of the land and waters where Ichthys LNG onshore facilities are located, in addition to the Whadjuk Nyoongar people on whose lands our Perth office is situated. Furthermore, Broome and Djarindjin are important logistical locations for transit of our offshore workforce, and we therefore extend our acknowledgement to the Yawuru, Bardi and Jawi peoples, respectively.

INPEX acknowledges the important role Aboriginal and Torres Strait Islander peoples continue to play in the development of our business in Australia and pay our respects to their Elders – past and present.