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A conditional value list means that under a certain condition only a subset of all possible values is available. When you use a conditional value list, the subset of available values is determined at run-time.

To create a conditional value list you need at least one value.

1. Create a new value list

2. Add at lease one item in the Items tab

3. Select the Conditions tab

4. Toggle the Conditional toggle. A table appears (like a decision table) summing up the values you just created on the Items tab. 

5. Define in the table:

   • Which conditions apply to the value list

   • Which value is shown when the condition is true by ticking the checkboxes

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An external value list means that the list is filled with values by an external source, i.e., a piece of code that supplies the values. As studio does not connect during design time to this external source, you cannot use the values for validating expressions or using drop downs. If you are sure that some values are present in this external source, you can define them in studio, so that you can validate on them in expressions, and use these values in drop downs. These values defined in studio are not exported to the runtime, and the runtime completely bases the values from the list on the external source.