Hi Anny,
try calling your procedure by prefixing the package name like I've done here with user_pkg.new:
set new_relation_id [db_exec_plsql insert_person {
begin
:1 := user_pkg.new(
creation_user => :user_last_changed,
creation_ip => :user_ip,
first_names => :first_names,
last_name => :last_name,
date_of_birth => :date_of_birth_date,
default_minor_p => :default_minor_p,
user_last_changed => :user_last_changed
);
end;
}
]