https://userapps.support.sap.com/sap/support/knowledge/en/2607894
2607894 - Sending SERNR (BOM Explosion Number) via ORDERS IDOC | SAP Knowledge Base Article
You want to send the internally-used SERNR (BOM, or Bill of Material Explosion Number) via outbound IDOC, such as the ORDERS IDOC function, but this is not...