How to group intercompany invoices based on Ship to location within same Legal Entity?

Summary

Intercompany Invoices with Special Tax Regime. Customer Organization with same VAT Number, same LE, same BU, but different Ship to locations. How to group different invoices.

Content

In this company, there is a Logistic Organization that centralizes inventory and material. This organization "sells" materials and equipment to Operational Companies (different Legal Entities). Due to Special Tax Regimes, there are regions within same country with special tax regimes and also special customs. However, in this implementation each country has one single VAT number per Country, one single Legal Entity and one single Business Unit.

The difference of Special Tax Regime is define by Ship To Location. However, to set it up to Supply Chain Financial Orchestration we´ve been required to create 2 different Business Units, one for Regular Regime and other for Special Tax Regime.