3832215 - Error "Baseline date for payment does not exist" when posting credit memo from Coupa via API_SUPPLIERINVOICE_PROCESS_SRV – SAP S/4HANA Cloud Public Edition

• An error occurs when posting a supplier credit memo/note from Coupa to the system via API.
• Error message: "Baseline date for payment does not exist".
• API call fails with HTTP 400 and message M8 356 (M8/356).

• SAP S/4HANA Cloud Public Edition
• Logistics Invoice Verification (Public Cloud)

1. Post a supplier credit memo/note from Coupa using API_SUPPLIERINVOICE_PROCESS_SRV.
2. Observe the API rejection with HTTP 400 and error "Baseline date for payment does not exist".

• The API request does not provide DueCalculationBaseDate and does not provide PaymentTerms, requiring the system to derive the baseline date from supplier data.
• Supplier payment terms are missing or configured to have no default baseline date, so the system cannot determine a baseline date and raises message M8 356.
• For credit memos, if the invoice reference does not resolve to a posted invoice and the separate “Credit Memo Payment Terms” on the supplier is not maintained, the system cannot derive a baseline date and the same error occurs.

1. For referenced credit memos, ensure the payload includes InvoiceReference and InvoiceReferenceFiscalYear that resolve to a posted invoice so the credit memo inherits baseline date and payment terms automatically.
2. For unreferenced credit memos and invoices, populate DueCalculationBaseDate in the API payload; optionally also send PaymentTerms to apply intended terms during due-date calculation.
3. Maintain supplier master data: in Company Code data (Payment Transactions), set a valid value in the “Credit Memo Payment Terms” field; ensure standard payment terms default a baseline date.
4. If configuration is required, use a dedicated terms-of-payment key that derives the baseline date from a real date (for example, document or posting date) rather than “no default”.
5. Re-send previously rejected documents after applying the fix so records are complete.

• Refer to: KBA 3253111 - Error M8356 "Baseline date for payment does not exist"
• Refer to: KBA 3149702 - Error when reverse accounting document via MRKO app
• Refer to: KBA 3464234 - How API_SUPPLIERINVOICE_PROCESS_SRV parameters map to invoice data
• Refer to: Manage Business Partner Master Data (F3163)
• Refer to: General Payment Settings (Maintain Terms of Payment)

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