VAT-exempt line without a seller VAT identifier

What it means

Lines exempt from VAT still require the seller to be identified for VAT (BT-31) — claiming an exemption is a VAT position, and the authorities need to know whose it is.

Can it be fixed automatically?

The fix is mechanical once you provide the value, but the value itself is yours: it cannot be derived from the invoice and will not be guessed.

How to fix it

Supply the seller VAT identifier. An exemption also requires a stated reason (BT-120/BT-121); check that it is present too.

Where it applies

Check your own invoice

curl -X POST https://einvoice.mgsoft.sk/v1/validate \
     -H 'Content-Type: application/xml' \
     --data-binary @invoice.xml

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