If you will ask for Electronic Italian Invoice, is mandatory to have these fields filled, and Company and Vat Code filled in Invoice Address <input type="hidden" name="id_tobewebto_fattura_elettronica" value=""> <input type="hidden" name="tobewebto_id_customer" value=""> <div class="form-group row"> <label class="col-md-3 form-control-label">PEC address</label> <div class="col-md-6"> <input type="email" name="tobewebto_pec" class="tobewebto_pec form-control" value=""/> </div> </div> <div class="form-group row"> <label class="col-md-3 form-control-label">Unique Code</label> <div class="col-md-6"> <input type="text" maxlength="7" name="tobewebto_sdicode" class="tobewebto_sdicode form-control" value=""/> </div> </div>