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It seems to me that this is a question to ask Dexxter itself, as you never know if something is in the state. But as far as I know, that's not possible. You can switch from subject to VAT to exempted from VAT.

However, you cannot switch from not subject to VAT to VAT-exempt, as this is determined when you create your profile. So you need to create a new profile with Article 44 (not subject to VAT) in the options.

Greetz Filip