Setting Up the Tax Number Field 
Use
You have to set up the tax number field for Peruvian company codes manually. To do so, you reassign the tax number field that is usually reserved for Chilean company codes to Peru.

If you have company codes in both Chile and Peru, you delete the field's country assignment altogether, which effectively assigns it to all countries (you cannot assign the field to more than one individual country). This causes the system to display the field in the master data of all company codes in all countries, but it has no use outside of Chile and Peru.
Procedure
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