Existing Wording: .... It is only invoked when the user is entering/editing the answer for the question linked to the candidateExpression. It is used when a population process can't determine the specific value to fill in to a form, but it can identify a list of candidates to choose from....

Comment:

As I understand it, the difference is that this one will typical depend on answers to other questions that are unknown at the population phase. If this is the case, I would add such clarification.

Summary:

Clarify when calculatedExpression is used