Intercompany / Multi-Currency / Multi-Terms Transfer Orders

We are attempting to integrate branch plants that belong to different companies within our organisation where each entity to entity may have different currencies, taxes and payment terms.

e.g.

Company 1 sells to company 2 in GBP, payment terms 30 days, 0 Tax

Company 1 sells to company 3 in TRY, payment terms 60 days 5% Tax

Company 3 sells to company 2 in EUR, payment terms 90 days, 5%tax

We wish to enter a single customer forecast in the final selling branch plant that via MRP (R3483) blows the demand through all dependent branch plants. Note : Intercompany Sales SI/SK/OK is not an option as goods are transferred between branches upon which each branch adds value via additional manufacturing processes before the goods are finally sold to the customer.