>>>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)

That's returning a promise so should work OK. Maybe the best way to set an error message would be to capture the promise here:

return services.Item.checkCodeUniqueness(codeObject).then( // Get the error message and set it on scope);