VAT is strictly tracked within Class 4:

You can download the official Excel/PDF file from the Belgian government's portal:

Tous les revenus de l'entreprise (ventes de marchandises, prestations de services). 3. Les comptes Hors Bilan (Classe 0)

Valeur des marchandises, matières premières et produits finis en réserve.

The Belgian chart is organized into (digits 1-9). It is a multi-column system that distinguishes between French (PCN - Plan Comptable Normalisé) and Dutch (WAV - Wetboek van vennootschappen en verenigingen) terminology.