3686615 - Error "document contains same order item more than once" when posting supplier invoices via standard API in SAP S/4HANA Cloud Public Edition

• When posting supplier invoices through the Standard API Supplier Invoice Integration (SAP_COM_0057), the system raises error message M8321 - "Document contains same order item more than once" when referencing multiple goods receipts (GRNs) against the same purchase order item with identical conditions.
• Additional error messages may include:
  • "Goods receipt item [GRN number] is invalid"

SAP S/4 HANA Cloud Public Edition

1. Post supplier invoices through the Standard API Supplier Invoice Integration (SAP_COM_0057) referencing multiple GRNs against the same purchase order item with identical conditions.
2. Observe the error messages: "Document contains same order item more than once" and "Goods receipt item [GRN number] is invalid."

The error occurs due to the following reasons:

1. Duplicate Freight/Planned Delivery Cost Items: The invoice payload contains multiple items with identical planned delivery cost conditions (freight) for the same purchase order item.

2. Invalid Reference Field Usage: Fields like ReferenceDocument, ReferenceDocumentItem, and ReferenceDocumentFiscalYear are incorrectly used for planned delivery cost items, which are not subject to goods receipt-based invoice verification.

1. For API Integration (SAP_COM_0057)

1. Consolidate Freight Items:
   • Combine all planned delivery cost/freight items for the same PO item into a single invoice item within the API payload.
   • Remove duplicate condition steps that reference the same purchase order item.
   • SAP standard API does not allow duplicate freight condition items within one invoice document.
2. Correct Reference Field Usage:
   • Do not use ReferenceDocument, ReferenceDocumentItem, and ReferenceDocumentFiscalYear fields for planned delivery cost items.
   • These fields are only applicable for goods receipt-based invoice verification scenarios.
3. Fix Fiscal Year Values:
   • Replace any fiscal year values set to "0000" with valid fiscal year values or leave it blank.
   • Ensure all fiscal year references in the payload correspond to actual fiscal periods.

2. For GR-Based Invoice Verification

When multiple goods receipts exist against the same purchase order item:

1. For GR-based items: Each GRN can be referenced separately with unique delivery note numbers.
2. For freight/planned delivery costs: Consolidate into single line items regardless of multiple GRNs.
3. Ensure unique delivery note values for each goods receipt to enable proper matching.

Payload Structure Adjustment

1. For GR-based items: Reference each GRN separately with unique identifiers.
2. For non-GR-based items: Consolidate freight/planned delivery costs into single line items.
3. Avoid duplicate references: Ensure no duplicate purchase order item references with identical conditions.

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