User exit to be triggered for PR05 when click on display/change/create

Hi,

If there a user exit or BADI that is triggered when I click on display / create / change a respective line of trips in transaction code PR05? I tried the following user exit but non is triggered when i click on the said button ( display / change / create ).

- FITR0001

- FITR0002

- FITR0003

- FITR0005

What i'm trying to achieve here is to default the Trip type based on the cost centre / WBS Element assigned for that particular trips. I highly appreciate for any feedback / help on this.

Cheers,

Loo