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If the invoice producer/promoter has been set-up for a given product, the document will display the information about that contact. If the invoice producer/promoter hasn't been set-up, the document will display the information of the main producer/promoter.
As illustrated above, the VAT details display one line for each producer/provider. If an order contains several products concerning the same producer/provider but with different VAT rates, the line concerning that producer/provider will be split for each VAT rate.
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