Final answer:
In a DCS detail report, a changed maturity date of a security is usually marked as "Changed Maturity," indicating a modification since the last report.
Step-by-step explanation:
When the maturity date of a security has changed since the last report date, it is typically displayed in the DCS detail report as "Changed Maturity". This notation indicates that there has been an alteration in the maturity timeframe of the security from what was previously reported. Entities use various systems for their financial reporting, and the exact representation can differ, but marking a maturity date that has changed is a common practice for clarity and transparency in financial reporting.