With document ID c03282611 on 2012/04/19 an advisory for HP Data Protector 6.21 and Data Protector 7.0 was released, describing a problem when restoring NDMP data.
There is fix avaliable and can be requested from HP, the fix will be included in the patches to be released by end of may 2012.
The complete advisory can be read here: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03282611&jumpid=em_alerts_us-us_Apr12_xbu_all_all_1701712_112088_software_critical_005_38