Hi I was thinking that would be good to have a tax register id field also in the contacts of a third.
Sometimes at least in some countries this is a required field or if not required is a way important one.
In Brasil for example have the CPF number which is a tax id for a person. In Italy there is a Codice Fiscale,
in Slovenija we have Davcna Stevilka (tax number). I think that this field is an important field and should