One way to validate data in a Variable or Field Object is by using Lists. 4D has the ability for a developer to import Lists for accepted as well as unaccepted values. In the "Property List" for a Variable Object, when selecting a "Variable Type", a list can be imported under the "Range of Values" section for "Required List" and "Excluded List" shown below in red:



Here are the Variable Types that can use Lists:

• String


• Text


• Numeric


• Date


• Time

• Creating a List manually


• Entry controls in 4D


• How to avoid getting stuck in the field that has Required List option turned on?


• Ways to filter numbers in an object variable