Reject function in onCustomValidation event not working

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Hey @ahmadnasriya , thanks for answering again. My backend function is based in the node-module iban , it’s the following:

var IBAN = require('iban');

export function validarIBAN(iban){
 let status = IBAN.isValid(iban);

 if (status){
 return ({
 'status': true,
 'iban': IBAN.electronicFormat(iban),
 'err':null
       });
    }
 else{
 return ({
 'status': false,
 'iban': null,
 'err': "IBAN erroni o no vàlid. Comprova'l i torna a provar"
       });
    }
}