BU rule to trigger if field is not blank

BU rule to trigger if field is not blank

Hi

I am trying to create a Business Rule that will trigger on condition Level not assigned, Category is an option from our list and another field is not Blank. If I leave the option for the other field as blank (empty) the condition is removed. How can a create a condition where this field is not blank? Do I user "" (quotes) or '' (single quotes) to distinguish a blank?

Regards

Graeme
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