This is a sample. We validated an EN 16931 example invoice (XRechnung 3.0, UBL) in which one line total was changed, so it is rejected on purpose. Your own file gets the same check.
With your own file, this is where you get the corrected file for 9 € — on this sample the repair made 1 change(s), fixed BR-CO-10, BR-CO-13 and the file then passed validation. We ran it just now, the same way it runs on yours.
[BR-CO-13]-Invoice total amount without VAT (BT-109) = Σ Invoice line net amount (BT-131) - Sum of allowances on document level (BT-107) + Sum of charges on document level (BT-108).
[BR-DE-TMP-32] Eine Rechnung sollte zur Angabe des Liefer-/Leistungsdatums entweder BT-72 "Actual delivery date", BG-14 "Invoicing period" oder in jeder Rechnungsposition BG-26 "Invoice line period" enthalten.