While preparing the (Belgian) vat declaration in our previous accounting program we could run a series of sanity checks to verify if the declaration would contain any unlikely combinations (like is the amount of VAT declared more than 21% of the base). Those are simple checks that - according to my accountant - the tax office uses as well to quickly scan for anomalies in the vat declarations.

I didn't find such checks in OpenERP. Are they in there and if so, how do I use them ?