FS813 – “Company code is not set up for OSS.”

[matiota]

Dear experts,

we are currently facing an issue in SAP S/4HANA Cloud Public Edition (release 2508) during billing processing.
The system raises the following error:

FS813 – “Company code XY is not set up for OSS.”

The error appears when a tax code containing OSS-related fields (OSS C/R, OSS Procedure) is used.

At this moment, we are unable to complete the billing process, and we cannot identify any available configuration activity in Public Cloud that would allow us to maintain or adjust OSS-related settings for the company code.

Observed Behavior

• The tax code is treated by the system as OSS-relevant.
• During billing, the system checks OSS registration for company code SWAN.
• Since no OSS configuration exists for this company code, the system stops processing with error FS813.

We reviewed all accessible configuration points (Define Tax Codes for Sales and Purchases, Tax Calculation Procedure, EU Code/Code settings, etc.), but none of them allow maintaining OSS registrations.
We also could not find any SSCUI, app, or CBC activity that would allow us to perform this setup on our side.

Could anybody please help us to understand how OSS registration for a company code should be maintained in SAP S/4HANA Cloud Public Edition?

Thank you.

Martina

[Divyesh_Mistry]

Hello Martina,

Below is my step by step analysis.

Topic	Details
Error	FS813 – “Company code XY is not set up for OSS.”
Where it occurs	During billing (SD Billing Document or Customer Invoice) using a tax code marked as OSS-relevant (fields OSS C/R, OSS Procedure).
Root Technical Cause	Billing engine identifies the tax code as OSS-relevant → checks OSS registration for the company code → no OSS registration exists → system stops processing with FS813.
Why the system thinks the tax code is OSS-relevant	The tax code includes OSS-related fields (OSS C/R, OSS Procedure), therefore triggering OSS logic.
Expected SAP Public Cloud behavior	OSS registration cannot be configured by customer. It must be configured by SAP in the backend (Global Tax Management).
What you cannot configure	No SSCUI, no CBC activity, no App for: • OSS registration • VAT OSS numbers • OSS tax determination • EU VAT regime setup • OSS procedures These settings are not exposed in S/4HANA Cloud Public Edition.
What you can configure	Standard tax code maintenance (Define Tax Codes), but OSS-specific fields are system-controlled and not editable.
Correct method to maintain OSS registration in Public Cloud	Through SAP Support only – SAP performs backend activation of OSS registration. Customer cannot maintain this manually.
Responsible SAP Support Component	FIN-TAX-LOCAL-OSS (preferred) or LO-MD-FI-TAX
Information SAP requires to activate OSS	• Company code • Legal company name • OSS Registration Number (EU OSS VAT number) • List of OSS member states (EU countries where registration applies) • Valid-from date • Screenshot of FS813 • Affected tax code(s)
After SAP activation	OSS registration is created in backend → billing reprocesses successfully → FS813 no longer appears.
When OSS must be activated	Whenever you use any tax code involving cross-border B2C EU VAT OSS logic (e-commerce, distance sales, electronic services, etc.).
Temporary Workaround (if billing must proceed immediately)	• Use a non-OSS tax code for the transaction. • Or duplicate the tax code but remove OSS C/R and OSS Procedure (if editable). • This bypasses OSS logic until SAP activates it.
Reason the customer cannot find configuration point	In Public Cloud, OSS functionality is fully automated, and all OSS registration data sits in protected backend tables maintained only by SAP. Not accessible to customers via CBC/SSCUI.
Why OSS is system-controlled	OSS is part of SAP Global Tax Service, which manages VAT registrations centrally to prevent compliance issues.
Link between Tax Code & OSS Registration	Tax code triggers OSS logic → system expects OSS registration for company code → missing data → FS813.
Common scenarios where FS813 appears	• Tax code created by customer with OSS fields populated • SAP standard tax code includes OSS settings • Sales from EU country to another EU member state using B2C model • E-commerce or distance sales scenarios
Final Solution Summary	SAP must activate OSS registration for your company code. Customer cannot do it inside the system. Raise SAP Support Ticket with details.

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Appreciate your feedback.
Thanks,
Divyesh