BR-CL-18

Explanation

The VAT category of a line or the VAT breakdown must be one of the codes EN 16931 allows: S (standard and reduced rates), Z (zero rated), E (exempt), AE (reverse charge), K (intra-Community supply), G (export), O (outside the scope of VAT), L (IGIC), M (IPSI) and B (split payment). The stated code is not one of them. Reduced rates have no code of their own; they are stated as S with the reduced rate.

How to fix

Ask the seller for a corrected invoice with an allowed category code.