IW21 - How to populate Functional Location/Equipment by default for specific Notification type ?

Hello Guru's,

We have a custom Notification type. Our requirement is to populate an default Functional Location and/or Equipment, when user enters Notification type in the initial screen and navigates to detail screen on transaction IW21.

I am not able to find an appropriate user exit for this.

If someone know how to achieve this, can you please guide ?

Appreciate your help.

Thanks.