Hi, I a evaluating Mendix for suitability for some applications and I have one that I am beat on. First Screen Select the Truck that will be using the App Second Screen Two lists to be shown. – First list is all staff available for duty – When staff are chosen from first list, they appear in the second list to show selected crew A button on the screen that when clicked creates an record of the current staffing, including a link to the truck selected in the first screen and the staff assigned to the second screen. I have tried using helper objects to use associations, but this appears to be particularly difficult as it needs to work offline. Anybody got a sample/demo that demonstrates this behaviour?