>>and then I tried to debug in VS 2017 but nothing happened at all. My validation code is not firing. Do you see what may be wrong? I did add the js file in the bundle.config.
>
>I see that you've got the directive to fire but what is this returning : return services.Item.checkCodeUniqueness(codeObject);
>Don't forget that this must be promise that will be resolved or rejected.

The Item Service code is this:

/**
     * @public
     * @param {object} 
     * @returns {ng.IPromise} 
     */
    ItemService.prototype.checkCodeUniqueness = function (codeObject) {
        var deferred = services.Deferred;

        services.Http.put(urlPath + '/checkCodeUniqueness', codeObject)
            .then(function (data) {
                if (data.data.isValid) {
                    deferred.resolve(data.data);
                }
                else
                {
                    deferred.reject(data.data.errorMessage);
                }
            });

        return deferred.promise;
    };

I haven't have a chance to test it yet and it is still not clear to me how would I assign returned error message to the error to display. I plan to have a few same directives in that form (I need to test both barcode and UPC)