Refer to a type include.

Hi Everyone:

I have a situation like this.

eg:

types: begin of y_test,

               include type vbak,

              a          type c,

               b          type c,

          end of y_test.

data:  wa_test      type      y_test.

now assuming wa_test is already populated  i need to pass 2 parameters from wa_test to a Class method  , lets say wa_test-vkorg and wa_test-vtweg .

How can i refer to the nested include inside y_test?