You want to use the partner's Global Location Number (GLN) and not the Business Partner ID in a webservice.
SAP Business ByDesign
Please check the following documentation available on Web Service and the use of GLN:
- Blog: Create ByD Sales Orders using Web Services. Section "B2B Collaboration for Sales Orders" shows a Sample XML request with the use of GLN.
- SAP ByDesign Help Document: Webservices. Section "Use of Standard IDs in B2B scenarios for collaboration partner identification" also refers to the use of GLN
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