Solution : https://service.sap.com/sap/support/notes/638483 (SAP Service marketplace login required)
Key words :
document-level maximum tax rules, -party tax system rfc server, document-level rfc call, -aprogramid -ggatewayhost -xgatewayservice note, assign external tax types, relevant ipc administrator settings, define external tax system, ipc administrator settings prior, external tax system, tax maintenance settings
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