Zero rated (Z): no exemption reason allowed

What does this error mean?

A VAT breakdown of category Z (zero rated) must not contain an exemption reason (BT-120/BT-121) — zero rating is not an exemption.

How to fix it

Remove the exemption reason or choose the appropriate category (E, AE, K, G).

Affected fields

• BT-120 VAT exemption reason text
• BT-121 VAT exemption reason code
• BG-23 VAT breakdown

← All validation rules
Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).