Ho trovato questa soluzione:
How to set VAT for a vendor (store)?
If you want that in your documents (invoice, delivery note, receipt) the VAT will be displayed, you can add the information about VAT into the language file (common), e.g.
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<?php
'VM_DELIVERY_VENDOR_VAT_NR1_LABEL' => 'VAT1',
'VM_DELIVERY_VENDOR_VAT_NR1_VALUE' => '1020304050',
'VM_DELIVERY_VENDOR_VAT_NR2_LABEL' => 'VAT2',
'VM_DELIVERY_VENDOR_VAT_NR2_VALUE' => 'EU1020304050'
?>
If the values will be not empty, the vendor's VAT will be displayed in document.
How to set VAT fields for customers? How to display the VAT in the document?
First go to Admin - Manage User Fields and publish extra field, e.g:
* extra_field_1 - change the name PHPSHOP_SHOPPER_FORM_EXTRA_FIELD_1 e.g. to VAT1
* extra_field_2 - change the name PHPSHOP_SHOPPER_FORM_EXTRA_FIELD_2 e.g. to VAT2
Than add the label name values in language file (common), e.g.:
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<?php
'PHPSHOP_SHOPPER_FORM_EXTRA_FIELD_1' => 'VAT1',
'PHPSHOP_SHOPPER_FORM_EXTRA_FIELD_2' => 'VAT2',
?>
If the values will be not empty, the customer's VAT will be displayed in document.