Hi Vaibhavi,
In SAP environment Enhancement is a word used for achieving the users's special requirements (not available in standard).
Few examples of such requirements in Notification context.
1. You want that in a particular type of Notification,a particular field say the Notification Short text, be filled with a Default value (as per your desire).
2. You want a Notification should not be saved without filling a field inside a tab other than the Header Data. (Configuration settings do not help here)
3. You want a filter effect in Catalogs & Codes tab, so that upon selecting a Code group in Object part & Damage Tab, same Code Group be automatically populated in other tabs namely Cause, Task & Activities)
4. You want an additional field in one of the Notification Tabs.
These are very few example, But you can get the concept with these examples.
Mostly in SAP terms these are known as User-Exit (Cusotmer-Exit).
Some times these requirements are fulfilled with Objcets called BADI.
If you are not conversant with ABAP or do not have access, then you'd need an ABAPer to implement these. These are very simple ABAP tasks.
Go through the following links to have a practical idea:
User Exit 'QQMA0014', the applications
F4 help filter in Catalogs & Codes tabs of Notification
Good lcuk
Jogeswara Rao K