Default value and hide Trip Schema field on ESS Portal

Hello,

I'm trying to hide and leave the trip schema field with a default value on ESS Portal.

I've checked and there is a BADI named TRIP_WEB_CUSTOMIZING but I don't think it fulfills my need. I think I only have access to fields that appear after choosing the trip schema.

Anyone have any ideias on how to achive this?

Thanks in advance.

Best regards,

Eva