3807353 - Batch changeset with mixed PATCH/POST causes wrong item mapping in sales document (e.g. API_SALES_ORDER_SRV), SAP S/4HANA

• In a single OData batch changeset for e.g. API_SALES_ORDER_SRV, mixing PATCH operations on existing items with POST operations that create new items leads to an incorrect order item structure.
• An item created via POST may take an unexpected item number, and subsequent PATCH requests can update the wrong item.
• Observed outcome: an item shows a different material number and/or title than provided in the payload (for example, data intended for one item appears on another).
• No explicit error message is returned by the API.

• SAP S/4HANA
• SAP S/4HANA Cloud Private Edition

API_SALES_ORDER_SRV, API_SALES_QUOTATION_SRV, OData batch, changeset ordering, PATCH POST DELETE, sales order items, wrong item mapping, material mismatch, text mismatch, item number interleaving, API, internal buffer, item index , KBA , SD-SLS-API , APIs for Sales Documents , Problem