What are the rules of triangular transactions?

When “B” in a triangle is in Poland is there any obligation to account for acquisition tax on the goods sent from A to C? If there is, which boxes of the VAT return are the output and input tax reported?


„B” is obliged to show in its VAT return only information re acquisition from „A” (boxes 33 and 70 of Polish VAT retur). In turn in Polish EC sales list “B” is obliged to show acquisition from “A” and sales to “C” and to indicate this transactions as a triangular transactions (column [d] in Polish EC sales lists). Moreover to recognise such transaction as triangular, the sales invoice from “B” to “C” must include additionally information regarding triangular transaction according to Polish VAT law.