I guess I understand now the behaviour. If I click on the checkbox and change the checkbox state from unchecked to checked then its only commited if I press the enter button or the tab button. There is no effect if I only click with the mouse in another field. (the checkbox state is left as it was)

try online example with Using Events: Change Client 3 of field client from 3 to 1 and don`t commit with enter or tab just click on another field. The formerly changed field remains the same.

But from the docu another behavious is described:

The cell is saved when