LPD_CUST customizing

Hello ,

I am trying to add Z webdynpro application in LPD_CUST .

My application should be added in  Existing Role and Instance .    I have given 'Z' in  Namespace and complete application in Application name.

When I try to navigate to application , I am reciving an error : Application /Z/<Myapplication_name>/ does not exist.

  Could you anybody throw light on this .

Thanking you ,

Regards,

Satya