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url: /technical/cube-validation-simple.md
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# Simple Validation

### Why a Simple Validation

When validation should always contain the same list of valid options, it doesn't change based on the current context of your workview/card, or a cell location.

### Creating a Simple Validation

Here's how it works in practice, using the Time dimension as an example.

![Time Month List](/time-monthlist.png)

Start with a hierarchy like the one above - in this case, a "Month List" hierarchy under Time, broken down by year and month.

Next, open the **Validation** tab on the workview to configure a rule against the **Time Mapping** measure:

![Cube Data Validation](/data-validation.png)

Here, a data validation is being applied to a **Time Mapping** string measure. This particular rule limits valid options to the top level of the "Month List" hierarchy in the Time dimension - so only entries at that level can be selected.

::: info

* The **Level** will always be set to the level of the simple list you would like displayed. If all of the Months were children of a parent, you would instead need to set Level to "The top level -1"
  :::

Once saved, the validation takes effect immediately at data-entry:

![Data Cube Selection](/data-select.png)

The validated string measure now displays a dropdown list of Months, constrained entirely by the validation rules just defined - keeping data entry consistent with the underlying hierarchy.