The "get details for list display" method is required for all evidence types and is used to populate the details field on the evidence list screens, apply evidence changes, and validate evidence changes screens. The details field also appears on a number of evidence approval screens including both the approve and reject evidence screens.
The purpose of the details field is to provide information significant to an evidence type across standard evidence screens. For example, the details field for income evidence screens might display the income amount and income frequency.