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Aaron Persich 9Aaron Persich 9 

Flow Validation Rule

I would like to see if it is possible to build a validation rule in my flow which will force the user to populate a field if a choice field is populated.  I have a Product dynamic choice field which query’s on the products and a Quantity number field in a screen.  If the user selects a product then I would like the validation rule to force the user to populate the quantity. 
Here are the flow elements:
Dynamic Choice:  {!OptionProductsA100}
Quantity:  QuantityOptionA100
User-added image

Any help is much appreciated.