Troubleshooting Business Partner Key Mapping Issues
Introduction
In the context of Business Partner integration via Web Service (SOAP), the replication process creates Business Partners and their associated objects, such as Customers, Vendors, Addresses, etc., using number ranges defined in the target system. It’s important to note that these objects may not necessarily be created with the same number ranges as those specified in the source system. To enable this flexibility, the interface utilizes a functionality known as Key Mapping, which is crucial to ensure that each object is correctly identified across the system landscape.
https://blogs.sap.com/2023/12/01/troubleshooting-business-partner-key-mapping-issues/