In Appian release notes of 21.4. Removal section contains
Process start forms and user input tasks can no longer be configured using in-line expressions. To configure new forms, directly select an interface and map inputs to your process variables. Existing expression-backed forms will continue to work as designed.
What does it really mean?
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Hi , In older versions we had capability to write expression while configuring forms in user input task. Now that has been removed in latest version.