Within the domain registration a VAT-ID is requested at WHMCS.
This would .de-TLD restrict to companies only.
If your registrar does not require this, the VAT field can be removed from the /includes/additionaldomainfields.php file. However some registrars do require this field, which is why it's present by default.
Which registrars do need that? They can´t even send this number to DENIC as it is not requested by the registry.
I assume this is a faulty requirement of the registrars.
Anyway, no deal to remove it with the described method. One still need to know that.
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