CMM Infraprojects Limited received a warning letter from the National Stock Exchange of India regarding a compliance issue related to the disclosure of a signatory's PAN in corporate announcements. The exchange emphasized that revealing personal identification data such as the PAN violates their regulations. The company has been advised to take corrective measures to prevent future occurrences and ensure compliance with exchange guidelines. The warning highlights the importance of adhering to disclosure norms to avoid potential actions from the exchange in case of further lapses. The company is also required to publicly disseminate this warning on stock exchanges where it is listed.