Resources to support suppliers throughout the SAP S4 transition, including blackout impacts, invoicing guidance, and key actions.
Halliburton will transition to SAP S4 on October 15, 2026. This change will impact how we transact with suppliers, customers, and external partners. Review what to expect before, during, and after the system blackout and go-live, including impacts to purchase orders and invoicing, by accessing the Supplier Resources Job Aid linked below.
Halliburton is committed to keeping suppliers informed throughout our SAP S4 transition. To help suppliers prepare for upcoming blackout periods and process changes, multiple communications have been shared in advance outlining key dates, required actions, and available resources. Please see below for communications previously sent to suppliers.
Action Required: HSN Decommissioning & New System Registration - Effective July 15, 2026
Upcoming Changes to Invoice Submission Processes - Effective August 1, 2026
Upcoming S/4 Cutover & Go Live – Important Information for Suppliers
| Period | Impact / Activity | Details |
|---|---|---|
| July 15 – September 29, 2026 | HSN Invoicing | Available for existing POs only |
| August 30 – October 15, 2026 | Vendor Account Changes | Creation and updates (name, address, bank details) unavailable |
| September 27 – October 15, 2026 | Invoice Submission (AP / EDI) | AP email submissions allowed but may have delayed status updates until after go-live EDI invoices continue and will be posted in S4 after go-live |
| September 29 – October 15, 2026 | Purchase Orders (POs) | No new POs or changes to existing POs (pricing, quantities) Manual POs allowed only for urgent cases SAP Business Network invoicing and PO collaboration will be disrupted due to ECC cutover |
| October 15, 2026 | System Go-Live | Systematic invoice processing resumes in S4 |
All dates subject to change.
Contact Us
Suppliers can easily submit and track inquiries through the Halliburton Request Tool (HRT). Please register for HRT on this page.
