Global Object Attribute local type

I created a local type in the class.

Loc. Definitions/Implementations

types:

   BEGIN OF ty_escal,

       level    TYPE i,

       urg(4)   TYPE n,

       high(4)  TYPE n,

       med(4)   TYPE n,

       low(4)   TYPE n,

   END OF ty_escal.

Now I want to create a private attribute of the class using this type.

I also would like to define a table type and create an private table of the same type.

What am I missing?