3786998 - Error M8_2/211 when posting supplier invoice via api_supplierinvoice_process_srv for service entry sheet

Posting a supplier invoice via API_SUPPLIERINVOICE_PROCESS_SRV for a service purchase order with a limit item and goods‑receipt‑based invoice verification fails.

The system returns error M8_2/211: "Service procurement: Goods receipt reversed for item XYZ". 

Manual posting of the first invoice works, but a subsequent posting via the API after releasing another service entry sheet fails.

XYZ means Item ID.

SAP S/4HANA Cloud Public Edition

1. Create a service purchase order with a limit item and enable goods‑receipt‑based invoice verification.
2. Create a service entry sheet for the order and release it.
3. Create and release an additional service entry sheet for the same order.
4. Post a supplier invoice via API_SUPPLIERINVOICE_PROCESS_SRV with reference to the service entry sheet and goods receipt.

1. Remove the toSupplierInvoiceItmAcctAssgmt (SupplierInvoiceItmAcctAssgmt) navigation block from the payload when posting the invoice via API with reference to a service entry sheet/limit item.
2. If the error persists, verify that the invoice header amount (invoiceGrossAmount) equals the sum of all item amounts in the payload.
3. Ensure quantity parameters follow guidance: provide purchaseOrderQuantityUnit and quantityInPurchaseOrderUnit at the item level and do not duplicate them in the account assignment block.

refer to: Error message M8_2/211 when using API to create supplier invoice

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