In Belgium, for the Belgian customers, the enterprise number must be filled in in addition to the Tax exempt number.

The enterprise number contains text and a ten-digit number.

The idea is to deduce the Enterprise number from the VAT ID (as the ten-digit number is the same) for the Belgian customers.

Because as there are 2 registrations ID to create (Enterprise number & VAT number) for Belgian customers, it's a risk to forget to create the enterprise number.

Furthermore, in AX2012, the Tax exempt number was deducted from the Enterprise number.