Adding fields in appresousrces.xml

Hi,

I am having a problem trying to add a new field to the appresources.xml. I have amended the downloadscheme.xml and the sql database is showing the new field. But when I go to the data element "employee details" and add the field. It errors when I try and encrypt it back. It is in the database as PersonnelSubarea but it doesn't like the name is appresources. Should I be using the sap field in the admin console of BTRTL?

Also where would I go to chnage the welcome page - i.e text and addition of a logo?

Many Thanks