If you accidentally remove an attribute in the AttributeManager, you can undo the removal by setting Action to 'Do Nothing'.

• A. It is not possible to undo
• B. You must recreate the attribute
• C. There is no undo option
• D. You can undo the removal by setting Action to 'Do Nothing'

Answer: (D)

In AttributeManager, each attribute has an action that determines how that attribute is treated in the transform. The Do Nothing action is a no-op: it leaves the attribute unchanged and passes it through as it was. If you had previously set an attribute's action to remove it, switching that same attribute’s action to Do Nothing tells FME not to apply the removal, effectively undoing the removal for the features currently being processed. This is why selecting Do Nothing is the best way to revert the change without recreating the attribute.