Barcode input - Field Action On User Input doesn't work

Barcode input - Field Action On User Input doesn't work

Dear Sir, 

While using barcode input, Submit form after capturing works but Field Action On User Input doesn't work in my app. But, if I do not select the  Submit form after capturing feature, it works fine through manual submission after capturing data via mobile barcode scanner. 

I have tried creating forms both in Creator and Appcreator directly but it doesn't work. 

Pls help. 

Thanks. 

Kashif