3102437 - You are Unable to Update Tax code in an Existing Supplier Invoice via Web Service

You have created supplier invoice via web service or manually. Now you want to update the tax code in the supplier invoice using web service (action codes 2, 4 etc), but system does not update the tax code.

SAP Business ByDesign

1. Log in to SOAP UI 
2. Execute SupplierInvoiceBundleMaintainRequest web service to create supplier invoice
3. OR Create supplier invoice manually from Supplier Invoicing view
4. Now try to update the tax code using web service SupplierInvoiceBundleMaintainRequest 
5. The system does not change any data.

Updating of tax code via web service is not supported at the moment.

As a workaround, you can update tax code manually or try a custom OData Service for supplier invoice to update tax code.

Purchase order shares the same behavior, you can refer to KBA 3198573 - Cannot define the tax date when creating purchase order via webservice

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