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Editorial Team
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Asked: 2026-05-26T10:01:51+00:00

In Oracle APEX, is it possible to create a validation so that field B

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In Oracle APEX, is it possible to create a validation so that field B cannot be null if a “Modem” is selected in field A? (field A is a Select List that contains a List of Values that uses a query to receive it’s list of values)

Thanks Tony,
Your solution makes sense but it didn’t work in my case.

Here is my validation:

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The result is not what I expected. I would like an error only to show up for “Unit Ip Address” when Modem is the selected Device Type when the field is null.
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Additional Info that describes the “Device Type”:
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1 Answer

  1. Editorial Team

    Yes – see this example, where field Commission cannot be null if “Salesman” is selected in field Job.

    It is simply a “Not Null” validation on item P15_COMMISSION, with a condition to perform the validation only when P15_JOB has the value “Salesman”

    This is the validation definition I used:
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    Note that the condition on the validation is based on the return value of the LOV, not the display value. In my case they happen to be the same, but in yours they are not and your condition should be based on the ID of the device type rather than the description.

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