Question

Is it possible to access a transaction registration parameter from the Extraction Rules activity in Advanced Designer?

Answer

1. The transaction registration parameter value can be written to some field via the Custom activity.
   
2. The Input field element in the Extraction Rules activity can be used to refer to the field from step 1:
   

Additional information

AU Help: Custom Activity 

EU Help: Custom Activity 

US Help: Custom Activity

AU Help: Input Field

EU Help: Input Field

US Help: Input Field