Symptoms

When using the autocomplete control, form validation fails, when using the keyboard to make a selection. (Using the arrow keys and the enter button)
 

Diagnoses

This was a bug in the product. When you use the mouse, everything validated as expected, but when using the keyboard, validation did not work.
 

Resolution

The fix was included in the latest roll-up and after applying the roll-up, validation worked using both the mouse and the keyboard.

If you run into this issue, please contact K2 support and request the latest roll-up for smartforms and the smartforms control pack.