Hello Ligin,
Regarding how to add a text area inside the view BT120H_CPL/Details, I think there might be several ways.
Way 1. Using AET tool, you can create a 'form view' Table, with a field of 'long text' type, render as 'text area'. Then you add this field into BT120H_CPL/Details view. It will be displayed as a text area.
Way 2. Add a block into view BT120H_CPL/Details, then embed an note text into this block via 'Component Usage'. We can find an example by:
Regarding how to populate text area:
If the content inside the text area are only to be displayed, and only retrieved dynamically when the interaction transaction is displayed, it will be simple: consider writing your codes to retrieve data on the GET_ method for the attribute which is bound to the text area.
Best regards, Corrine
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