When you download an equipment from ERP, you meet with this error message: Communication error with the external tax system (VERTEX)
Since the tax code determination is not relevant for IObject analysis in co deployment, it could be suppressed by a BAdI implementation:
After that download is performed successfully.
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Communication error with the external tax system VERTEX
原文：https://www.cnblogs.com/sap-jerry/p/12189077.html