A Self-Adaptive #Trigger transforms and validates fields on the triggering records before they're committed to the database. Unlike #Trigger Actions, which operate on related data, a Self-Adaptive #Trigger treats the triggering records as both input and output.

To create a Self-Adaptive #Trigger:

1. Create a new Executable enabling #Trigger.
2. Set the source and target objects to the same object.
3. Choose Update as the action.
4. Set both the Target Matching Field and the Mapping to Id — telling the engine that the records being evaluated are the same ones that fired the trigger.
5. For in-memory field transformations, enable Before Insert and/or Before Update. For validations, enable any trigger event and use the ERROR function in Field Mappings or Scope Filters to conditionally fail records with custom messages.