Default party Id in New Request (OrderMgr)

[Koon Sang]

Using a user with MYPORTAL_CUSTOMER security group, I want to create a request.  There is a field for me to enter the party Id.  How do we fix the party Id to be the party Id of the login user and do not allow the user to change?
Thanks!

Ofbiz version: 9.04 (2010-02-17)