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louisa barrett 7louisa barrett 7 

Dependent Picklist in Flow

I'm trying to set up a screen in a visual flow using the new lightningruntime:dependent picklist. I'm getting the following error 'error:top picklist missing' when the screen is displayed. If I run it via debug, then I can see the values are being populated.
Fault_Category__c is the controlling field with Fault_Type__c it's dependent.
The Fault_Category__c field is already set, the user should just be able to select a Fault_Type__c.
On the flow screen, only the Fault_Category__c picklist is being displayed, but it has an error of error:top picklist missing

Dependent picklist component
Dependent Picklist Component

Debug Info
Dependent Picklist Debug


Many thanks for any assistance