XV-PL-10

An invoice in PLN has no converted tax (…); those fields are for an invoice in a foreign currency (FA(3) information sheet, P_14_1W).

error: the document is invalid

What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element

Context
/fa:Faktura/fa:Fa
Test
not($pln) or not(fa:P_14_1W | fa:P_14_2W | fa:P_14_3W | fa:P_14_4W)

Checked with KSeF FA(3)