Is there a way to mark several fields as invalid, if one of the fields contains a special string?
You can create a mutli-field field validation Business rule and map all needed fields. Within this Business rule you can check if the value exists in any of this fields for example by using a expression node. If the Business Rule fails, all involved fields are marked as invalid.
Here you can find some further information in the KTA Online Help:
Level of Complexity
|Kofax Total Agility||7.9|
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Article # 3037682