Solution : https://service.sap.com/sap/support/notes/1290518 (SAP Service marketplace login required)
Key words :
terms activity wrong timestamp, lastupdate timestamp reason, update timestamp, gmt format, client timezone, correct date, attachments tab, prerequisites, displaying, activities
Related Notes :
| 1352811 | 1.5 SP2 SAMA .net/Java fixes Composite note |