Default Key values in BOR object type

Hi,

I have created a custom object type with two key fields. This is in a dialog mode. I want to default the key fields with some values. Is there a way to achieve this. I tried writing code in DISPLAY but does not work.

below is my scenario:

I am using enhancement for creating a contact in the Insurance Object EXIT_SAPLBPT1_007. Exit 007 is called just before the dialog box appears and based on the Business Partner and the Insurance Object i need to select the fields in form DB table so that user does not to everytime enter the values.

Ar ethere is any function module to achieve this?

Thank you

Govind