The authorities want visa officers to enter notes directly into the Global Case Management System (GCMS). Alternatively, visa officers would need to paste the notes into the Global Case Management System (GCMS) immediately after the interview.
Typically, the authorities give a higher probative weight to notes that are contemporaneous with the interview. This is particularly the case with the Federal Court and the Immigration Appeal Division. This is because the Federal Court and the Immigration Appeal Division accord higher priority to everything that took place during the interview.
In addition, situations could arise where the officers transfer notes into the Global Case Management System (GCMS) after the date of the interview. In this scenario, the officers would need to explain clearly the reasons behind the delay. In addition, they would also need to indicate the date when the interview took place.
Source: Citizenship and Immigration